Nanomechanical characterization of quantum interference in a topological insulator nanowire

2019-10-04T10:36:10+00:00October 4th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 04 October 2019; doi:10.1038/s41467-019-12560-4The density of states (DOS) of a topological insulator nanowire is expected to show Aharonov-Bohm (AB) oscillations, but they are never observed so far. Here, Kim et al. reveal AB oscillations in the DOS of a Bi2Se3 nanowire via nanomechanical resonance measurements.

Published in: "Nature Communications".

Soliton superlattices in twisted hexagonal boron nitride

2019-09-25T10:40:28+00:00September 25th, 2019|Categories: Publications|Tags: , |

Nature Communications, Published online: 25 September 2019; doi:10.1038/s41467-019-12327-xSolitons may develop when strain forms at line defects separating commensurate domains in misaligned or lattice-mismatched van der Waals heterostructures. Here, the authors use atomic-force microscopy and nano-infrared spectroscopy to image solitons in thin hBN crystals in the form of long-range periodic superstructures, creating sub-surface hexagonal networks with periods of a few hundred nanometers.

Published in: "Nature Communications".

Perfect proton selectivity in ion transport through two-dimensional crystals

2019-09-18T10:39:23+00:00September 18th, 2019|Categories: Publications|Tags: , |

Nature Communications, Published online: 18 September 2019; doi:10.1038/s41467-019-12314-2Defect-free monolayers of graphene and hexagonal boron nitride are highly permeable to thermal protons, but are impenetrable to gases. Here the authors show that mechanically exfoliated crystals exhibit perfect proton selectivity, corroborating proton transport through the bulk without atomic-scale defects.

Published in: "Nature Communications".

Enhancing and controlling valley magnetic response in MoS<sub>2</sub>/WS<sub>2</sub> heterostructures by all-optical route

2019-09-17T10:39:30+00:00September 17th, 2019|Categories: Publications|Tags: , |

Nature Communications, Published online: 17 September 2019; doi:10.1038/s41467-019-12128-2Van der Waals heterostructures may offer a suitable platform for all-optical manipulation of valleytronic devices. Here, the authors observe a strong enhancement of the valley magnetic response in MoS2, and magnetic tuning of the polarization of MoS2 direct optical transition

Published in: "Nature Communications".

Giant valley splitting in monolayer WS<sub>2</sub> by magnetic proximity effect

2019-09-13T10:39:22+00:00September 13th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 13 September 2019; doi:10.1038/s41467-019-11966-4Valley degree of freedom promises the additional control of electrons in 2D materials but is limited by small valley splitting. Here the authors show heavily enhanced valley splitting in monolayer WS2 on EuS substrate due to competing ferromagnetic and antiferromagnetic exchange interactions for Eu- and S-terminated EuS surface sites.

Published in: "Nature Communications".

Gaussian synapses for probabilistic neural networks

2019-09-13T10:39:20+00:00September 13th, 2019|Categories: Publications|Tags: , , |

Nature Communications, Published online: 13 September 2019; doi:10.1038/s41467-019-12035-6Designing large-scale hardware implementation of Probabilistic Neural Network for energy efficient neuromorphic computing systems remains a challenge. Here, the authors propose an hardware design based on MoS2/BP heterostructures as reconfigurable Gaussian synapses enabling EEG patterns recognition.

Published in: "Nature Communications".

Fermi level-tuned optics of graphene for attocoulomb-scale quantification of electron transfer at single gold nanoparticles

2019-08-26T10:47:55+00:00August 26th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 26 August 2019; doi:10.1038/s41467-019-11816-3Measurement of single-molecule level electron transfer is restricted by detection limits in nanoampere to picoampere ranges. Here the authors develop graphene-based electrochemical microscopy to attain an attoampere-level detection limit for faraday current at single nanoparticles.

Published in: "Nature Communications".

Coherent anti-Stokes Raman spectroscopy of single and multi-layer graphene

2019-08-14T10:47:36+00:00August 14th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 14 August 2019; doi:10.1038/s41467-019-11165-1Coherent anti-Stokes Raman Scattering (CARS) accesses the vibrational properties of a material via nonlinear four-wave mixing (FWM); CARS in graphene has not been observed to date despite its high nonlinear third-order susceptibility. Here, the authors devised a FWM scheme to perform stimulated Raman spectroscopy in single and multi-layer graphene through CARS.

Published in: "Nature Communications".

A biomimetic 2D transistor for audiomorphic computing

2019-08-01T16:43:28+00:00August 1st, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 01 August 2019; doi:10.1038/s41467-019-11381-9Biomimetic audiomorphic functionalities can be implemented in solid-state devices including 2D materials. Here, the authors fabricate a device based on multiple split gates with nano-gaps on a single semiconducting MoS2 channel that captures the neurobiological architecture and computational map inside the auditory cortex of barn owl.

Published in: "Nature Communications".

Reconfigurable two-dimensional optoelectronic devices enabled by local ferroelectric polarization

2019-07-26T19:00:48+00:00July 26th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 26 July 2019; doi:10.1038/s41467-019-11328-0Photodetectors based on two dimensional (2D) materials still suffer from low performance. Here, the authors tackle this issue by introducing a reconfigurable design enabled by locally tuning the doping of a 2D molybdenum disulfide film through the polarization of an underlying ferroelectric material.

Published in: "Nature Communications".

Nanoscale mapping of quasiparticle band alignment

2019-07-23T16:42:32+00:00July 23rd, 2019|Categories: Publications|Tags: , , |

Nature Communications, Published online: 23 July 2019; doi:10.1038/s41467-019-11253-2Sharp atomic interfaces between materials dictate the interface’s electronic properties. The authors use angle-resolved photoemission spectroscopy with a spatial resolution of ~500 nm to investigate the nanoscale electronic band structure and band alignment in a lateral heterostructure composed of WS2 placed on alternating nano-stripes of monolayer and bilayer graphene.

Published in: "Nature Communications".

2D semiconductor nonlinear plasmonic modulators

2019-07-22T14:47:11+00:00July 22nd, 2019|Categories: Publications|

Nature Communications, Published online: 22 July 2019; doi:10.1038/s41467-019-11186-wPlasmonic modulators have many possible applications in optical-frequency devices. Here the authors report a 2D semiconductor nonlinear plasmonic modulator enabled through strong interaction between the surface plasmon polaritons and excitons in a monolayer semiconductor integrated on top of a metallic waveguide.

Published in: "Nature Communications".

Programmable graphene nanobubbles with three-fold symmetric pseudo-magnetic fields

2019-07-16T22:43:38+00:00July 16th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 16 July 2019; doi:10.1038/s41467-019-11038-7Presence of nano-bubbles within an atomically thin material generates potentially large pseudo-magnetic fields. Here, the authors report an innovative technique to induce nano-bubbles in graphene with desirable features and high precision through energized AFM tips, and experimentally measure three-fold symmetric pseudo-magnetic fields up to 120 T.

Published in: "Nature Communications".

Van der Waals negative capacitance transistors

2019-07-10T17:01:43+00:00July 10th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 10 July 2019; doi:10.1038/s41467-019-10738-4The adaptation to atomically thin 2D semiconductors and van der Waals layered ferroelectrics can enable negative capacitance transistors with superior performance and bendability. Here, the authors report flexible negative capacitance transistors based on MoS2 and a ferroelectric dielectric CIPS with a minimum sub-threshold slope of 28 mV/dec and high gain logic invertors.

Published in: "Nature Communications".

Bioinspired extracellular vesicles embedded with black phosphorus for molecular recognition-guided biomineralization

2019-06-27T19:34:36+00:00June 27th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 27 June 2019; doi:10.1038/s41467-019-10761-5Bone regeneration is of interest for treating a wide range of medical conditions. Here, the authors report on bioinspired matrix vesicles loaded with black phosphorus nanosheets and cell-specific aptamers for bone regeneration and demonstrate bone defect repair in vivo.

Published in: "Nature Communications".

Interlayer epitaxy of wafer-scale high-quality uniform AB-stacked bilayer graphene films on liquid Pt<sub>3</sub>Si/solid Pt

2019-06-26T21:13:31+00:00June 26th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 26 June 2019; doi:10.1038/s41467-019-10691-2Specific stacking sequence of graphene can enable observation of unusual properties however it has been difficult to obtain this over wider areas. Here, the authors report wafer-scale growth of 100% AB-stacked bilayer graphene films by CVD on liquid Pt3Si/solid Pt substrates showing high quality and improved mechanical properties comparable to the mechanically exfoliated flakes.

Published in: "Nature Communications".

Interlayer epitaxy of wafer-scale high-quality uniform AB-stacked bilayer graphene films on liquid Pt<sub>3</sub>Si/solid Pt

2019-06-26T21:13:32+00:00June 26th, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 26 June 2019; doi:10.1038/s41467-019-10691-2Specific stacking sequence of graphene can enable observation of unusual properties however it has been difficult to obtain this over wider areas. Here, the authors report wafer-scale growth of 100% AB-stacked bilayer graphene films by CVD on liquid Pt3Si/solid Pt substrates showing high quality and improved mechanical properties comparable to the mechanically exfoliated flakes.

Published in: "Nature Communications".

Nonreciprocal charge transport at topological insulator/superconductor interface

2019-06-21T10:37:19+00:00June 21st, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 21 June 2019; doi:10.1038/s41467-019-10658-3The superconducting proximity effect on the surface state of a topological insulator is promising to generate topological superconductivity. Here, Yasuda et al. reported enhanced nonreciprocal charge transport in a Bi2Te3/FeTe heterostructure with an emerging superconducting order parameter.

Published in: "Nature Communications".

Nonreciprocal charge transport at topological insulator/superconductor interface

2019-06-21T10:37:19+00:00June 21st, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 21 June 2019; doi:10.1038/s41467-019-10658-3The superconducting proximity effect on the surface state of a topological insulator is promising to generate topological superconductivity. Here, Yasuda et al. reported enhanced nonreciprocal charge transport in a Bi2Te3/FeTe heterostructure with an emerging superconducting order parameter.

Published in: "Nature Communications".

Site-selectively generated photon emitters in monolayer MoS<sub>2</sub> via local helium ion irradiation

2019-06-21T10:37:14+00:00June 21st, 2019|Categories: Publications|Tags: |

Nature Communications, Published online: 21 June 2019; doi:10.1038/s41467-019-10632-zLight emitters can be induced in transition metal dichalcogenides by defect engineering, but challenges remain in their controlled spatial positioning. Here, the authors irradiate monolayer MoS2 with a sub-nm focused helium ion beam to deterministically create defects, and obtain spectrally narrow emission lines that produce photons in the visible spectral range

Published in: "Nature Communications".

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