Intervalley Excitonic Hybridization, Optical Selection Rules, and Imperfect Circular Dichroism in Monolayer $htext{−}mathrm{BN}$

2022-02-04T15:37:33+00:00February 4th, 2022|Categories: Publications|Tags: |

Author(s): Fang Zhang, Chin Shen Ong, Jia Wei Ruan, Meng Wu, Xing Qiang Shi, Zi Kang Tang, and Steven G. LouieWe perform first-principles GW plus Bethe-Salpeter equation calculations to investigate the photophysics of monolayer hexagonal boron nitride (h−BN), revealing excitons with novel k-space characteristics. The excitonic states forming the first and third peaks in its absorption spectrum are s-like, b…[Phys. Rev. Lett. 128, 047402] Published Thu Jan 27, 2022

Published in: "Physical Review Letters".

Observation of Antiferromagnetic Order as Odd-Parity Multipoles inside the Superconducting Phase in ${mathrm{CeRh}}_{2}{mathrm{As}}_{2}$

2022-02-04T15:37:32+00:00February 4th, 2022|Categories: Publications|

Author(s): Mayu Kibune, Shunsaku Kitagawa, Katsuki Kinjo, Shiki Ogata, Masahiro Manago, Takanori Taniguchi, Kenji Ishida, Manuel Brando, Elena Hassinger, Helge Rosner, Christoph Geibel, and Seunghyun KhimSpatial inversion symmetry in crystal structures is closely related to the superconducting (SC) and magnetic properties of materials. Recently, several theoretical proposals that predict various interesting phenomena caused by the breaking of the local inversion symmetry have been presented. However…[Phys. Rev. Lett. 128, 057002] Published Thu Feb 03, 2022

Published in: "Physical Review Letters".

Ripple Patterns Spontaneously Emerge through Sequential Wrinkling Interference in Polymer Bilayers

2022-02-04T15:37:30+00:00February 4th, 2022|Categories: Publications|

Author(s): Luca Pellegrino, Annabelle Tan, and João T. CabralWe report the formation of “ripple” patterns by the sequential superposition of nonorthogonal surface waves excited by the spontaneous buckling of polymeric bilayers. Albeit of a different nature and micron scale compared to the familiar sedimentary ripples caused by gentle wave oscillations, we fin…[Phys. Rev. Lett. 128, 058001] Published Wed Feb 02, 2022

Published in: "Physical Review Letters".

Raman Linewidth Contributions from Four-Phonon and Electron-Phonon Interactions in Graphene

2022-02-04T15:37:26+00:00February 4th, 2022|Categories: Publications|Tags: |

Author(s): Zherui Han, Xiaolong Yang, Sean E. Sullivan, Tianli Feng, Li Shi, Wu Li, and Xiulin RuanThe Raman peak position and linewidth provide insight into phonon anharmonicity and electron-phonon interactions in materials. For monolayer graphene, prior first-principles calculations have yielded decreasing linewidth with increasing temperature, which is opposite to measurement results. Here, we…[Phys. Rev. Lett. 128, 045901] Published Tue Jan 25, 2022

Published in: "Physical Review Letters".

Ab Initio Prediction of a Negative Barkas Coefficient for Slow Protons and Antiprotons in LiF

2022-02-04T15:37:25+00:00February 4th, 2022|Categories: Publications|

Author(s): Xixi Qi, Fabien Bruneval, and Ivan MaliyovWe report the ab initio prediction of a negative Barkas coefficient in lithium fluoride (LiF) insulator at low velocity (v<0.25  a.u., Ekin∼2  keV). The electronic stopping power of protons in LiF has been extensively studied both experimentally and theoretically because of a controversial thresh…[Phys. Rev. Lett. 128, 043401] Published Mon Jan 24, 2022

Published in: "Physical Review Letters".

Localized Nanoresonator Mode in Plasmonic Microcavities

2020-03-10T13:11:59+00:00March 10th, 2020|Categories: Publications|Tags: |

Author(s): A. Casalis de Pury, X. Zheng, O. S. Ojambati, A. Trifonov, C. Grosse, M-E. Kleemann, V. Babenko, D. Purdie, T. Taniguchi, K. Watanabe, A. Lombardo, G. A. E. Vandenbosch, S. Hofmann, and J. J. BaumbergSubmicron-thick hexagonal boron nitride crystals embedded in noble metals form planar Fabry-Perot half-microcavities. Depositing Au nanoparticles on top of these microcavities forms previously unidentified angle- and polarization-sensitive nanoresonator modes that are tightly laterally confined by t…[Phys. Rev. Lett. 124, 093901] Published Fri Mar 06, 2020

Published in: "Physical Review Letters".

Widely Tunable Quantum Phase Transition from Moore-Read to Composite Fermi Liquid in Bilayer Graphene

2020-03-10T13:11:50+00:00March 10th, 2020|Categories: Publications|Tags: |

Author(s): Zheng Zhu, D. N. Sheng, and Inti SodemannWe develop a proposal to realize a widely tunable and clean quantum phase transition in bilayer graphene between two paradigmatic fractionalized phases of matter: the Moore-Read fractional quantum Hall state and the composite Fermi liquid metal. This transition can be realized at total fillings ν=±3…[Phys. Rev. Lett. 124, 097604] Published Thu Mar 05, 2020

Published in: "Physical Review Letters".

Valley Polarization and Inversion in Strained Graphene via Pseudo-Landau Levels, Valley Splitting of Real Landau Levels, and Confined States

2020-03-10T13:11:36+00:00March 10th, 2020|Categories: Publications|Tags: |

Author(s): Si-Yu Li, Ying Su, Ya-Ning Ren, and Lin HeIt is quite easy to control spin polarization and the spin direction of a system via magnetic fields. However, there is no such direct and efficient way to manipulate the valley pseudospin degree of freedom. Here, we demonstrate experimentally that it is possible to realize valley polarization and v…[Phys. Rev. Lett. 124, 106802] Published Tue Mar 10, 2020

Published in: "Physical Review Letters".

Possible Kitaev Quantum Spin Liquid State in 2D Materials with $S=3/2$

2020-03-10T13:11:29+00:00March 10th, 2020|Categories: Publications|

Author(s): Changsong Xu, Junsheng Feng, Mitsuaki Kawamura, Youhei Yamaji, Yousra Nahas, Sergei Prokhorenko, Yang Qi, Hongjun Xiang, and L. BellaicheA strong Kitaev term predicted to be found in a series of Cr-based 2D magnets indicates possible quantum spin liquid states in those materials when subjected to epitaxial strain.[Phys. Rev. Lett. 124, 087205] Published Thu Feb 27, 2020

Published in: "Physical Review Letters".

Nature of the Correlated Insulator States in Twisted Bilayer Graphene

2020-03-10T13:11:26+00:00March 10th, 2020|Categories: Publications|Tags: |

Author(s): Ming Xie and A. H. MacDonaldWe use self-consistent Hartree-Fock calculations performed in the full π-band Hilbert space to assess the nature of the recently discovered correlated insulator states in magic-angle twisted bilayer graphene (TBG). We find that gaps between the flat conduction and valence bands open at neutrality ov…[Phys. Rev. Lett. 124, 097601] Published Mon Mar 02, 2020

Published in: "Physical Review Letters".

Two-Dimensional Second-Order Topological Insulator in Graphdiyne

2019-12-18T20:33:02+00:00December 18th, 2019|Categories: Publications|

Author(s): Xian-Lei Sheng, Cong Chen, Huiying Liu, Ziyu Chen, Zhi-Ming Yu, Y. X. Zhao, and Shengyuan A. YangA second-order topological insulator (SOTI) in d spatial dimensions features topologically protected gapless states at its (d−2)-dimensional boundary at the intersection of two crystal faces, but is gapped otherwise. As a novel topological state, it has been attracting great interest, but it remains…[Phys. Rev. Lett. 123, 256402] Published Wed Dec 18, 2019

Published in: "Physical Review Letters".

Energy Drag in Particle-Hole Symmetric Systems as a Quantum Quench

2019-12-13T16:33:33+00:00December 13th, 2019|Categories: Publications|Tags: , |

Author(s): William Berdanier, Thomas Scaffidi, and Joel E. MooreTwo conducting quantum systems coupled only via interactions can exhibit the phenomenon of Coulomb drag, in which a current passed through one layer can pull a current along in the other. However, in systems with particle-hole symmetry—for instance, the half filled Hubbard model or graphene near the…[Phys. Rev. Lett. 123, 246603] Published Fri Dec 13, 2019

Published in: "Physical Review Letters".

Optically Controlled Orbitronics on a Triangular Lattice

2019-12-06T16:33:11+00:00December 6th, 2019|Categories: Publications|Tags: |

Author(s): Võ Tiến Phong, Zachariah Addison, Seongjin Ahn, Hongki Min, Ritesh Agarwal, and E. J. MeleThe propagation of electrons in an orbital multiplet dispersing on a lattice can support anomalous transport phenomena deriving from an orbitally induced Berry curvature. In striking contrast to the related situation in graphene, we find that anomalous transport for an L=1 multiplet on the primitive…[Phys. Rev. Lett. 123, 236403] Published Fri Dec 06, 2019

Published in: "Physical Review Letters".

Geometric and Conventional Contribution to the Superfluid Weight in Twisted Bilayer Graphene

2019-12-05T22:33:02+00:00December 5th, 2019|Categories: Publications|Tags: , |

Author(s): Xiang Hu, Timo Hyart, Dmitry I. Pikulin, and Enrico RossiBy tuning the angle between graphene layers to specific “magic angles” the lowest energy bands of twisted bilayer graphene (TBLG) can be made flat. The flat nature of the bands favors the formation of collective ground states and, in particular, TBLG has been shown to support superconductivity. When…[Phys. Rev. Lett. 123, 237002] Published Thu Dec 05, 2019

Published in: "Physical Review Letters".

Electronic Properties of $αtext{−}{mathrm{RuCl}}_{3}$ in Proximity to Graphene

2019-12-02T16:33:50+00:00December 2nd, 2019|Categories: Publications|Tags: |

Author(s): Sananda Biswas, Ying Li, Stephen M. Winter, Johannes Knolle, and Roser ValentíStrain and charge-transfer between alpha-RuCl3 and graphene play crucial roles in inducing metallicity, or even exotic superconductivity, in this system, and in enhancing the Kitaev interaction.[Phys. Rev. Lett. 123, 237201] Published Mon Dec 02, 2019

Published in: "Physical Review Letters".

Sachdev-Ye-Kitaev Non-Fermi-Liquid Correlations in Nanoscopic Quantum Transport

2019-11-26T18:34:50+00:00November 26th, 2019|Categories: Publications|

Author(s): Alexander Altland, Dmitry Bagrets, and Alex KamenevElectronic transport in nanostructures, such as long molecules or 2D exfoliated flakes, often goes through a nearly degenerate set of single-particle orbitals. Here we show that in such cases a conspiracy of the narrow band and strong e-e interactions may stabilize a non-Fermi-liquid phase in the un…[Phys. Rev. Lett. 123, 226801] Published Tue Nov 26, 2019

Published in: "Physical Review Letters".

Higher-Order Topological Insulator in Twisted Bilayer Graphene

2019-11-22T16:32:32+00:00November 22nd, 2019|Categories: Publications|Tags: |

Author(s): Moon Jip Park, Youngkuk Kim, Gil Young Cho, and SungBin LeeWith the appearance of corner states at unexpectedly large angles, as long as its crystalline symmetry is left intact, twisted bilayer graphene functions as a higher-order topological insulator.[Phys. Rev. Lett. 123, 216803] Published Fri Nov 22, 2019

Published in: "Physical Review Letters".

Anisotropic Two-Dimensional Screening at the Surface of Black Phosphorus

2019-11-21T20:33:57+00:00November 21st, 2019|Categories: Publications|Tags: |

Author(s): Brian Kiraly, Elze J. Knol, Klara Volckaert, Deepnarayan Biswas, Alexander N. Rudenko, Danil A. Prishchenko, Vladimir G. Mazurenko, Mikhail I. Katsnelson, Philip Hofmann, Daniel Wegner, and Alexander A. KhajetooriansElectronic screening can have direct consequences for structural arrangements on the nanoscale, such as on the periodic ordering of adatoms on a surface. So far, such ordering phenomena have been explained in terms of isotropic screening of free electronlike systems. Here, we directly illustrate the…[Phys. Rev. Lett. 123, 216403] Published Thu Nov 21, 2019

Published in: "Physical Review Letters".

Some say, that 2D Research is the best website in the world.