Graphene Oxide Membranes with Narrow Inter-Sheet Galleries for Enhanced Hydrogen Separation

2019-02-14T14:39:28+00:00February 14th, 2019|Categories: Publications|Tags: , |

Chem. Commun., 2019, Accepted ManuscriptDOI: 10.1039/C8CC10283J, CommunicationAmr F. M. Ibrahim, Fateme Banihashemi, Jerry LinThis paper reports synthesis of graphene oxide (GO) membranes with narrow interlayer free spacing on scalable polyester substrates using GO sheets prepared by Brodie’s method. The GO membranes show interlayer…The content of this RSS Feed (c) The Royal Society of Chemistry

Published in: "Chemical Communications".

Enhanced photoelectrical response of thermodynamically epitaxial organic crystals at the two-dimensional limit

2019-02-14T10:50:35+00:00February 14th, 2019|Categories: Publications|

Enhanced photoelectrical response of thermodynamically epitaxial organic crystals at the two-dimensional limitEnhanced photoelectrical response of thermodynamically epitaxial organic crystals at the two-dimensional limit, Published online: 14 February 2019; doi:10.1038/s41467-019-08573-8To realize efficient optoelectronic devices based on two-dimensional (2D) organic crystals, optimizing the photoelectrical response and growth of these materials at the 2D limit is vital. Here, the authors report enhanced internal photoresponse in large-area 2D crystals using a novel growth method.

Published in: "Nature Communications".

Improved Charge Extraction Beyond Diffusion Length by Layer‐by‐Layer Multistacking Intercalation of Graphene Layers inside Quantum Dots Films

2019-02-14T10:50:14+00:00February 14th, 2019|Categories: Publications|Tags: |

A novel architecture based on layer‐by‐layer multistacking intercalation of graphene inside quantum dot (QD) films is studied. The intercalated graphene layers ensure improved charge extraction beyond the diffusion length of the QDs, offering superior quantum efficiency over single‐bottom graphene/QD devices, and overcoming the restriction that the diffusion length imposes on film thickness. Abstract Charge collection is critical in any photodetector or photovoltaic device. Novel materials such as quantum dots (QDs) have extraordinary light absorption properties, but their poor mobility and short diffusion length limit efficient charge collection using conventional top/bottom contacts. In this work, a novel architecture based on multiple intercalated chemical vapor deposition graphene monolayers distributed in an orderly manner inside a QD film is studied. The intercalated graphene layers ensure that at any point in the absorbing material, photocarriers will be efficiently collected and transported. The devices with intercalated graphene layers have superior quantum efficiency over single‐bottom graphene/QD devices, overcoming the known restriction that the diffusion length imposes on film thickness. QD film with increased thickness shows efficient charge collection over the entire λ ≈ 500–1000 nm spectrum. This architecture could be applied to boost the performance of other low‐cost materials with poor mobility, allowing efficient collection for films thicker than their diffusion length.

Published in: "Advanced Materials".

An electrochemical thermal transistor. (arXiv:1901.04639v1 [] CROSS LISTED)

2019-02-14T04:30:37+00:00February 14th, 2019|Categories: Publications|Tags: , |

The ability to actively regulate heat flow at the nanoscale could be a game changer for applications in thermal management and energy harvesting. Such a breakthrough could also enable the control of heat flow using thermal circuits, in a manner analogous to electronic circuits. Here we demonstrate switchable thermal transistors with an order of magnitude thermal on/off ratio, based on reversible electrochemical lithium intercalation in MoS2 thin films. We use spatially-resolved time-domain thermoreflectance to map the lithium ion distribution during device operation, and atomic force microscopy to show that the lithiated state correlates with increased thickness and surface roughness. First principles calculations reveal that the thermal conductance modulation is due to phonon scattering by lithium rattler modes, c-axis strain, and stacking disorder. This study lays the foundation for electrochemically-driven nanoscale thermal regulators, and establishes thermal metrology as a useful probe of spatio-temporal intercalant dynamics in nanomaterials.

Published : "arXiv Mesoscale and Nanoscale Physics".

Quantum-dot-like states in molybdenum disulfide nanostructures due to the interplay of local surface wrinkling, strain, and dielectric confinement. (arXiv:1902.05001v1 [cond-mat.mes-hall])

2019-02-14T04:30:35+00:00February 14th, 2019|Categories: Publications|Tags: |

The observation of quantum light emission from atomically thin transition metal dichalcogenides has opened a new field of applications for these material systems. The corresponding excited charge-carrier localization has been linked to defects and strain, while open questions remain regarding the microscopic origin. We demonstrate that the bending rigidity of these materials leads to wrinkling of the two-dimensional layer. The resulting strain field facilitates strong carrier localization due to its pronounced influence on the band gap. Additionally, we consider charge carrier confinement due to local changes of the dielectric environment and show that both effects contribute to modified electronic states and optical properties. The interplay of surface wrinkling, strain-induced confinement, and local changes of the dielectric environment is demonstrated for the example of nanobubbles that form when monolayers are deposited on substrates or other two-dimensional materials.

Published : "arXiv Mesoscale and Nanoscale Physics".

Elastic constants of graphene: Comparison of empirical potentials and DFT calculations. (arXiv:1902.04855v1 [cond-mat.mes-hall])

2019-02-14T04:30:30+00:00February 14th, 2019|Categories: Publications|Tags: , |

The capacity of popular classical interatomic potentials to describe elastic properties of graphene is tested. The Tersoff potential, Brenner reactive bond-order potentials REBO-1990, REBO-2000, REBO-2002 and AIREBO as well as LCBOP, PPBE-G, ReaxFF-CHO and ReaxFF-C2013 are considered. Linear and non-linear elastic response of graphene under uniaxial stretching is investigated by static energy calculations. The Young’s modulus, Poisson’s ratio and high-order elastic moduli are verified against the reference data available from experimental measurements and ab initio studies. The density functional theory calculations are performed to complement the reference data on the effective Young’s modulus and Poisson’s ratio at small but finite elongations. It is observed that for all the potentials considered, the elastic energy deviates remarkably from the simple quadratic dependence already at elongations of several percent. Nevertheless, LCBOP provides the results consistent with the reference data and thus realistically describes in-plane deformations of graphene. Reasonable agreement is also observed for the computationally cheap PPBE-G potential. REBO-2000, AIREBO and REBO-2002 give a strongly non-linear elastic response with a wrong sign of the third-order elastic modulus and the corresponding results are very far from the reference data. The ReaxFF potentials drastically overestimate the Poisson’s ratio. Furthermore, ReaxFF-C2013 shows a number of numerical artefacts at finite elongations. The bending rigidity of graphene is also obtained by static energy calculations for large-diameter carbon nanotubes. The best agreement with the experimental and ab initio data in this case is achieved using the REBO-2000, REBO-2002 and ReaxFF potentials. Therefore, none of the considered potentials adequately describes

Published : "arXiv Mesoscale and Nanoscale Physics".

Multifunctional van der Waals Broken‐Gap Heterojunction

2019-02-14T02:38:28+00:00February 14th, 2019|Categories: Publications|Tags: , , |

By employing a black phosphorus (BP)/rhenium disulfide (ReS2) heterojunction, the tunability of the BP work function with variation in flake thickness is exploited to demonstrate that a BP‐based broken‐gap heterojunction can manifest diverse current‐transport characteristics such as p–n junction diodes, Esaki‐diodes, back‐ward‐rectifying diodes, and nonrectifying devices along with a multifunctional device. Abstract The finite energy band‐offset that appears between band structures of employed materials in a broken‐gap heterojunction exhibits several interesting phenomena. Here, by employing a black phosphorus (BP)/rhenium disulfide (ReS2) heterojunction, the tunability of the BP work function (Φ BP) with variation in flake thickness is exploited in order to demonstrate that a BP‐based broken‐gap heterojunction can manifest diverse current‐transport characteristics such as gate tunable rectifying p–n junction diodes, Esaki diodes, backward‐rectifying diodes, and nonrectifying devices as a consequence of diverse band‐bending at the heterojunction. Diversity in band‐bending near heterojunction is attributed to change in the Fermi level difference (Δ) between BP and ReS2 sides as a consequence of Φ BP modulation. No change in the current transport characteristics in several devices with fixed Δ also provides further evidence that current‐transport is substantially impacted by band‐bending at the heterojunction. Optoelectronic experiments on the Esaki diode and the p–n junction diode provide experimental evidence of band‐bending diversity. Additionally, the p+–n–p junction comprising BP (38 nm)/ReS2/BP(5.8 nm) demonstrates multifunctionality of binary and ternary inverters as well as exhibiting the behavior of a bipolar junction transistor with common‐emitter current gain up to 50.

Published in: "Small".

Accelerating Photogenerated Charge Kinetics via the Synergetic Utilization of 2D Semiconducting Structural Advantages and Noble‐Metal‐Free Schottky Junction Effect

2019-02-14T02:38:23+00:00February 14th, 2019|Categories: Publications|Tags: |

The advantages of 2D semiconductors and the noble‐metal‐free Schottky junction effect are utilized to accelerating photogenerated charge kinetics. Abstract Although photocatalysis is one of the most promising technologies for environmental and energy issues, the irreconcilable contradiction between the absorption of the visible light and the strong redox capability of the photocatalyst and the low photocatalytic reaction kinetics result in the poor efficiency. Here, a composite photocatalyst is reported with high redox capability and accelerated reaction kinetics synergistically utilizing 2D semiconducting structural advantages and the noble‐metal‐free Schottky junction effect. The 2D structure can not only increase the bandgap of the photocatalyst but also improve the transfer and separation of the photogenerated charge carriers. Furthermore, the introduction of the noble‐metal‐free Schottky junction effect accelerates the photocatalytic reaction kinetics. The Schottky barrier can also prevent the photogenerated charges trapped by the electron acceptor from flowing back to the semiconductor, which can further boost the photocatalytic performance. The transfer process of the photogenerated charge carriers is also researched in detail by the comprehensive characterization methods, which enable the photocatalytic mechanism to be revealed.

Published in: "Small".

Recent Progress on Germanene and Functionalized Germanene: Preparation, Characterizations, Applications, and Challenges

2019-02-14T02:38:20+00:00February 14th, 2019|Categories: Publications|Tags: , |

Germanene and functionalized germanene have attracted intensive attention due to their exotic electronic properties and potential applications in electronic, energy and catalysis. Recent research progress on germanene and its counterparts functionalized by chemical groups is reviewed comprehensively. The synthesis, characteristics, and applications in energy storage and catalysis are introduced. Abstract A new family of single‐atom‐thick 2D germanium‐based materials with graphene‐like atomic arrangement, germanene and functionalized germanene, has attracted intensive attention due to their large bandgap and easily tailored electronic properties. Unlike carbon atoms in graphene, germanium atoms tend to adopt mixed sp2/sp3 hybridization in germanene, which makes it chemically active on the surface and allows its electronic states to be easily tuned by chemical functionalization. Impressive achievements in terms of the applications in energy storage and catalysis have been reported by using germanene and functionalized germanene. Herein, the fabrication of epitaxial germanene on different metallic substrates and its unique electronic properties are summarized. Then, the preparation strategies and the fundamental properties of hydrogen‐functionalized germanene (germanane or GeH) and other ligand‐terminated forms of germanene are presented. Finally, the progress of their applications in energy storage and catalysis, including both experimental results and theoretical predictions, is analyzed.

Published in: "Small".

Remarkable Improvement in Photocatalytic Performance for Tannery Wastewater Processing via SnS2 Modified with N‐Doped Carbon Quantum Dots: Synthesis, Characterization, and 4‐Nitrophenol‐Aided Cr(VI) Photoreduction

2019-02-14T02:38:17+00:00February 14th, 2019|Categories: Publications|Tags: |

0D N‐doped carbon quantum dots (N23‐CQDs) are demonstrated in accelerating the charge separation and transfer and thereby boosting the activity of a narrow‐bandgap SnS2. To promote carrier utilization, 4‐nitrophenol is taken as hole acceptor, and the efficiency of Cr(VI) photoreduction is further enhanced. Abstract Photocatalytic pathways are proved crucial for the sustainable production of chemicals and fuels required for a pollution‐free planet. Electron–hole recombination is a critical problem that has, so far, limited the efficiency of the most promising photocatalytic materials. Here, the efficacy of the 0D N doped carbon quantum dots (N‐CQDs) is demonstrated in accelerating the charge separation and transfer and thereby boosting the activity of a narrow‐bandgap SnS2 photocatalytic system. N‐CQDs are in situ loaded onto SnS2 nanosheets in forming N‐CQDs/SnS2 composite via an electrostatic interaction under hydrothermal conditions. Cr(VI) photoreduction rate of N‐CQDs/SnS2 is highly enhanced by engineering the loading contents of N‐CQDs, in which the optimal N‐CQDs/SnS2 with 40 mol% N‐CQDs exhibits a remarkable Cr(VI) photoreduction rate of 0.148 min−1, about 5‐time and 148‐time higher than that of SnS2 and N‐CQDs, respectively. Examining the photoexcited charges via zeta potential, X‐ray photoelectron spectroscopy (XPS), surface photovoltage, and electrochemical impedance spectra indicate that the improved Cr(VI) photodegradation rate is linked to the strong electrostatic attraction between N‐CQDs and SnS2 nanosheets in composite, which favors efficient carrier utilization. To further boost the carrier utilization, 4‐nitrophenol is introduced in this photocatalytic system and the efficiency of Cr(VI) photoreduction is further promoted.

Published in: "Small".

Big to Small: Ultrafine Mo2C Particles Derived from Giant Polyoxomolybdate Clusters for Hydrogen Evolution Reaction

2019-02-14T02:38:14+00:00February 14th, 2019|Categories: Publications|Tags: |

Giant molybdenum‐based polyoxometalate clusters create ultrafine molybdenum carbide nanoparticles with smaller and narrower size distribution and superior catalytic activity for the hydrogen evolution reaction. Abstract Due to its electronic structure, similar to platinum, molybdenum carbides (Mo2C) hold great promise as a cost‐effective catalyst platform. However, the realization of high‐performance Mo2C catalysts is still limited because controlling their particle size and catalytic activity is challenging with current synthesis methods. Here, the synthesis of ultrafine β‐Mo2C nanoparticles with narrow size distribution (2.5 ± 0.7 nm) and high mass loading (up to 27.5 wt%) on graphene substrate using a giant Mo‐based polyoxomolybdate cluster, Mo132 ((NH4)42[Mo132O372(CH3COO)30(H2O)72]·10CH3COONH4·300H2O) is demonstrated. Moreover, a nitrogen‐containing polymeric binder (polyethyleneimine) is used to create MoN bonds between Mo2C nanoparticles and nitrogen‐doped graphene layers, which significantly enhance the catalytic activity of Mo2C for the hydrogen evolution reaction, as is revealed by X‐ray photoelectron spectroscopy and density functional theory calculations. The optimal Mo2C catalyst shows a large exchange current density of 1.19 mA cm−2, a high turnover frequency of 0.70 s−1 as well as excellent durability. The demonstrated new strategy opens up the possibility of developing practical platinum substitutes based on Mo2C for various catalytic applications.

Published in: "Small".

Few‐Layered Tin Sulfide Nanosheets Supported on Reduced Graphene Oxide as a High‐Performance Anode for Potassium‐Ion Batteries

2019-02-14T02:38:07+00:00February 14th, 2019|Categories: Publications|Tags: , , |

Few‐layered SnS2 nanosheets vertically alligned on reduced graphene oxide nanosheets are demonstrated as high‐performance anode material for potassium‐ion batteries. Besides the high specific capacities based on sequential conversion and alloying reactions, excellent rate capability and cycling stability are also achieved by enhanced surface charge storage, fast electron/ionic transportation, and improved structural stability, benifiting from the subtle structure engineering. Abstract Anodes involving conversion and alloying reaction mechanisms are attractive for potassium‐ion batteries (PIBs) due to their high theoretical capacities. However, serious volume change and metal aggregation upon potassiation/depotassiation usually cause poor electrochemical performance. Herein, few‐layered SnS2 nanosheets supported on reduced graphene oxide ([email protected]) are fabricated and investigated as anode material for PIBs, showing high specific capacity (448 mAh g−1 at 0.05 A g−1), high rate capability (247 mAh g−1 at 1 A g−1), and improved cycle performance (73% capacity retention after 300 cycles). In this composite electrode, SnS2 nanosheets undergo sequential conversion (SnS2 to Sn) and alloying (Sn to K4Sn23, KSn) reactions during potassiation/depotassiation, giving rise to a high specific capacity. Meanwhile, the hybrid ultrathin nanosheets enable fast K storage kinetics and excellent structure integrity because of fast electron/ionic transportation, surface capacitive‐dominated charge storage mechanism, and effective accommodation for volume variation. This work demonstrates that K storage performance of alloy and conversion‐based anodes can be remarkably promoted by subtle structure engineering.

Published in: "Small".

High‐Performance Integrated Enzyme Cascade Bioplatform Based on Protein–BiPt [email protected] Oxide Hybrid Guided One‐Pot Self‐Assembly Strategy

2019-02-14T02:38:05+00:00February 14th, 2019|Categories: Publications|Tags: , |

Meticulous design of a protein/bimetallic hybrid nanozyme with notable peroxidase‐like activity and unique physicochemical surface properties provides a facile and efficient way to fabricate high‐performance integrated artificial enzyme cascade systems using self‐assembly instead of chemical processes. This will fill the gap in developing robust nanoenzyme‐triggered enzyme cascade platforms with practical applications. Abstract Nanozymes provide new opportunities for facilitating next generation artificial enzyme cascade platforms. However, the fabrication of high‐performance integrated artificial enzyme cascade (IAEC) bioplatforms based on nanozymes remains a great challenge. A facile and effective self‐assembly strategy for constructing an IAEC system based on an inorganic/protein hybrid nanozyme, β‐casein‐BiPt [email protected] (CA‐[email protected]) nanohybrid with unique physicochemical surface properties and hierarchical structures, is introduced here. Due to the synergetic effect of the protein, GO, and Bi3+, the hybrid acts as highly adaptable building blocks to immobilize natural enzymes directly and noncovalently without the loss of enzyme activity. Simultaneously, the CA‐[email protected] nanohybrid exhibits outstanding peroxidase‐mimicking activity and works well with natural oxidases, resulting in prominent activity in catalyzing cascade reactions. As a result, the proposed IAEC bioplatform exhibits excellent sensitivity with a wide linear range of 0.5 × 10‐6 to 100 × 10‐6m and a detection limit of 0.05 × 10‐6m for glucose. Meticulous design of ingenious hierarchically nanostructured nanozymes with unique physicochemical surface properties can provide a facile and efficient way to immobilize and stabilize nature enzymes using self‐assembly instead of chemical processes, and fill the gap in developing robust nanozyme–triggered IAEC systems with applications in the environment, sensing, and synthetic

Published in: "Small".

2D Semiconductor Nonlinear Plasmonic Modulators. (arXiv:1902.04626v1 [cond-mat.mtrl-sci])

2019-02-14T02:29:31+00:00February 14th, 2019|Categories: Publications|Tags: , |

A plasmonic modulator is a device that controls the amplitude or phase of propagating plasmons. In a pure plasmonic modulator, the presence or absence of a pump plasmonic wave controls the amplitude of a probe plasmonic wave through a channel. This control has to be mediated by an interaction between disparate plasmonic waves, typically requiring the integration of a nonlinear material. In this work, we demonstrate the first 2D semiconductor nonlinear plasmonic modulator based on a WSe2 monolayer integrated on top of a lithographically defined metallic waveguide. We utilize the strong coupling between the surface plasmon polaritons, SPPs, and excitons in the WSe2 to give a 73 percent change in transmission through the device. We demonstrate control of the propagating SPPs using both optical and SPP pumps, realizing the first demonstration of a 2D semiconductor nonlinear plasmonic modulator, with a modulation depth of 4.1 percent, and an ultralow switching energy estimated to be 40 aJ.

Published in: "arXiv Material Science".

Raman spectrum of 1T’-WTe2 under tensile strain: A first-principles prediction. (arXiv:1902.04676v1 [cond-mat.mtrl-sci])

2019-02-14T02:29:28+00:00February 14th, 2019|Categories: Publications|Tags: |

Monolayer WTe2 attracts rapidly growing interests for its large-gap quantum spin Hall effect,which enables promising apllications in flexible logic devices. Due to one-dimensional W-W chains,1T’-WTe2 exhibits unique anisotropic structure and promising properties, which can be modified by simply applying strains. Based on the first-principles simulations, we show that phonon branch undergoes soft down to negative frequency at special q points under different critical strains, i.e., epsilon_a = 11.55 percent along a-axis (with W-W chains) direction, epsilon_b = 7.0 percent along b-axis direction and epsilon_ab = 8.44 percent along biaxial direction. Before each critical strain, the Raman-shift of A1_g, A3_g, and A4_g modes, corresponding to the main peaks in Raman spectra of 1T’-WTe2 , shows anisotropic response to uniaxial strain but most sensitive to biaxial strain. Interestingly, we find that the frequency shift of A3_g mode show parabolic characters of strained 1T’-WTe2, then we split it into two parts and it shows a Raman-shift transition at about 5 percent strains. While for the A1_g and A4_g modes,the frequencies change linearly. Through careful structure and vibration analysis, we try to explain these Raman irregularity in strained 1T’-WTe2.

Published in: "arXiv Material Science".

Scanning Tunneling Microscopy of an Air Sensitive Dichalcogenide Through an Encapsulating Layer. (arXiv:1902.04808v1 [cond-mat.mes-hall])

2019-02-14T02:29:24+00:00February 14th, 2019|Categories: Publications|Tags: , |

Many atomically thin exfoliated 2D materials degrade when exposed to ambient conditions. They can be protected and investigated by means of transport and optical measurements if they are encapsulated between chemically inert single layers in the controlled atmosphere of a glove box. Here, we demonstrate that the same encapsulation procedure is also compatible with scanning tunneling microscopy (STM) and spectroscopy (STS). To this end, we report a systematic STM/STS investigation of a model system consisting of an exfoliated 2H-NbSe2 crystal capped with a protective 2H-MoS2 monolayer. We observe different electronic coupling between MoS2 and NbSe2, from a strong coupling when their lattices are aligned within a few degrees to 2 essentially no coupling for 30{deg} misaligned layers. We show that STM always probes intrinsic NbSe2 properties such as the superconducting gap and charge density wave at low temperature when setting the tunneling bias inside the MoS2 band gap, irrespective of the relative angle between the NbSe2 and MoS2 lattices. This study demonstrates that encapsulation is fully compatible with STM/STS investigations of 2D materials.

Published in: "arXiv Material Science".

Anisotropic thermal transport in magnetic intercalates Fe$_{x}$TiS$_2$. (arXiv:1902.04975v1 [cond-mat.mtrl-sci])

2019-02-14T02:29:20+00:00February 14th, 2019|Categories: Publications|Tags: |

We present a study of the of thermal transport in thin single crystals of iron-intercalated titanium disulphide, Fe$_{x}$TiS$_2$ for $0leq x leq 0.20$. We determine the distribution of intercalants using high-resolution crystallographic and magnetic measurements, confirming the insertion of Fe without long-range ordering. We find that iron intercalation perturbs the lattice very little, and suppresses the tendency of TiS$_2$ to self-intercalate with excess Ti. We observe trends in the thermal conductivity that are compatible with our ab initio calculations of thermal transport in perfectly stoichiometric TiS$_2$.

Published in: "arXiv Material Science".

Coherent Control of Two-Dimensional Excitons. (arXiv:1902.05036v1 [cond-mat.mes-hall])

2019-02-14T02:29:17+00:00February 14th, 2019|Categories: Publications|

Electric dipole radiation can be controlled by coherent optical feedback, as has previously been studied by modulating the photonic environment for point dipoles placed both in optical cavities and near metal mirrors. In experiments involving fluorescent molecules, trapped ions and quantum dots the point nature of the dipole, its sub-unity quantum efficiency, and decoherence rate conspire to severely limit any change in total linewidth. Here we show that the transverse coherence of exciton emission in the monolayer two-dimensional (2D) material MoSe${}_2$ removes many of the fundamental physical limitations present in previous experiments. The coherent interaction between excitons and a photonic mode localized between the MoSe${}_2$ and a nearby planar mirror depends interferometrically on mirror position, enabling full control over the radiative coupling rate from near-zero to 1.8 meV and a corresponding change in exciton total linewidth from 0.9 to 2.3 meV. The highly radiatively broadened exciton resonance (a ratio of up to $3:1$ in our samples) necessary to observe this modulation is made possible by recent advances in 2D materials sample fabrication. Our method of mirror translation is free of any coupling to strain or DC electric field in the monolayer, which allows a fundamental study of this photonic effect. The weak coherent driving field in our experiments yields a mean excitation occupation number of ${sim} 10^{-3}$ such that our experiments correspond to probing radiative reaction in the regime of perturbative quantum electrodynamics. This system will serve as a testbed for exploring new excitonic physics and quantum nonlinear optical effects.

Published in: "arXiv Material Science".

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