Inversion Symmetry Breaking Induced Valley Hall Effect in Multilayer WSe2

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 9325-9331 ◽  
Author(s):  
Hongming Guan ◽  
Ning Tang ◽  
Hao Huang ◽  
Xiaoyue Zhang ◽  
Meng Su ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Hall Effect ◽  
Inversion Symmetry ◽  
Valley Hall Effect

Effect of the inversion symmetry breaking on the orbital Hall effect: A model study

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
Pratik Sahu ◽  
Sayantika Bhowal ◽  
S. Satpathy
Keyword(s):  
Symmetry Breaking ◽  
Hall Effect ◽  
Inversion Symmetry ◽  
Model Study

Valley Hall Effect in Bilayer Graphene with Electrically Broken Inversion Symmetry

2016 ◽  
Author(s):  
Y. Shimazaki ◽  
M. Yamamoto ◽  
I.V. Borzenets ◽  
K. Watanabe ◽  
T. Taniguchi ◽  
...  
Keyword(s):  
Hall Effect ◽  
Bilayer Graphene ◽  
Inversion Symmetry ◽  
Valley Hall Effect

scholarly journals Spin-layer locking induced second-order nonlinear effect in centrosymmetric crystals

2020 ◽  
Author(s):  
Yanchong Zhao ◽  
Luojun Du ◽  
Jing Liang ◽  
Mohammad Bahramy ◽  
Mingwei Yang ◽  
...  
Keyword(s):  
Hall Effect ◽  
First Principles ◽  
Nonlinear Effect ◽  
Quantum Spin ◽  
Second Order ◽  
Inversion Symmetry ◽  
First Principles Calculations ◽  
Quantum Spin Hall Effect ◽  
Valley Hall Effect ◽  
Insight Into

Abstract According to the generally accepted nonlinear principles, second-order nonlinear effect (SONE) is strongly inhibited by the crystalline symmetries and thus can manifest only in non-centrosymmetric materials with broken global spatial inversion symmetry. In stark contrast, here we report the observation of direct-current (DC) related SONE, including circular and linear photogalvanic effects, in centrosymmetric bilayer and multilayer MoS2. In conjunction with relativistic first-principles calculations, we uncover that the observed DC-related SONE in inversion-symmetric MoS2 results from the localized electronic states and the locking of spin with the layer and valley pseudospins. Our results provide a new insight into nonlinear physics and would be applicable to other phenomena thus far believed to occur only in non-centrosymmetric systems, such as quantum spin Hall effect, valley Hall effect, piezoelectricity and unconventional Ising superconductivity.

scholarly journals Bilayer graphene under pressure: Electron-hole symmetry breaking, valley Hall effect, and Landau levels

2016 ◽  
Vol 93 (23) ◽  
Author(s):  
F. Munoz ◽  
H. P. Ojeda Collado ◽  
Gonzalo Usaj ◽  
Jorge O. Sofo ◽  
C. A. Balseiro
Keyword(s):  
Symmetry Breaking ◽  
Hall Effect ◽  
Bilayer Graphene ◽  
Landau Levels ◽  
Electron Hole ◽  
Valley Hall Effect

scholarly journals Ultrafast non-excitonic valley Hall effect in MoS2/WTe2 heterobilayers

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jekwan Lee ◽  
Wonhyeok Heo ◽  
Myungjun Cha ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantitative Information ◽  
Exciton Energy ◽  
Electron Hole ◽  
Kerr Rotation ◽  
Polarized Electrons ◽  
Spatially Resolved ◽  
Long Valley ◽  
Bound Electron ◽  
Valley Hall Effect

AbstractThe valley Hall effect (VHE) in two-dimensional (2D) van der Waals (vdW) crystals is a promising approach to study the valley pseudospin. Most experiments so far have used bound electron-hole pairs (excitons) through local photoexcitation. However, the valley depolarization of such excitons is fast, so that several challenges remain to be resolved. We address this issue by exploiting a unipolar VHE using a heterobilayer made of monolayer MoS2/WTe2 to exhibit a long valley-polarized lifetime due to the absence of electron-hole exchange interaction. The unipolar VHE is manifested by reduced photoluminescence at the MoS2 A exciton energy. Furthermore, we provide quantitative information on the time-dependent valley Hall dynamics by performing the spatially-resolved ultrafast Kerr-rotation microscopy; we find that the valley-polarized electrons persist for more than 4 nanoseconds and the valley Hall mobility exceeds 4.49 × 103 cm2/Vs, which is orders of magnitude larger than previous reports.

scholarly journals Crystalline Arrays of Pairs of Molecular Rotors: Correlated Motion, Rotational Barriers, and Space-Inversion Symmetry Breaking Due to Conformational Mutations

2013 ◽  
Vol 135 (25) ◽  
pp. 9366-9376 ◽  
Author(s):  
Cyprien Lemouchi ◽  
Konstantinos Iliopoulos ◽  
Leokadiya Zorina ◽  
Sergey Simonov ◽  
Pawel Wzietek ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Molecular Rotors ◽  
Inversion Symmetry ◽  
Rotational Barriers ◽  
Correlated Motion ◽  
Space Inversion

Improper Inversion Symmetry Breaking and Piezoelectricity through Oxygen Octahedral Rotations in Layered Perovskite Family, LiRTiO4(R= Rare Earths)

2015 ◽  
Vol 2 (1) ◽  
pp. 1500196 ◽  
Author(s):  
Arnab Sen Gupta ◽  
Hirofumi Akamatsu ◽  
Megan E. Strayer ◽  
Shiming Lei ◽  
Toshihiro Kuge ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Rare Earths ◽  
Layered Perovskite ◽  
Inversion Symmetry

scholarly journals Microscopic Origin of the Valley Hall Effect in Transition Metal Dichalcogenides Revealed by Wavelength-Dependent Mapping

Nano Letters ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 5719-5725 ◽  
Author(s):  
Nicolas Ubrig ◽  
Sanghyun Jo ◽  
Marc Philippi ◽  
Davide Costanzo ◽  
Helmuth Berger ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hall Effect ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides ◽  
Valley Hall Effect ◽  
Microscopic Origin
Sign in / Sign up

Export Citation Format

Share Document