Half-metallic quantum valley Hall effect in biased zigzag-edge bilayer graphene nanoribbons

2017 ◽  
Vol 95 (8) ◽  
Author(s):  
Kyu Won Lee ◽  
Cheol Eui Lee
Keyword(s):  
Hall Effect ◽  
Graphene Nanoribbons ◽  
Bilayer Graphene ◽  
Zigzag Edge ◽  
Half Metallic ◽  
Valley Hall Effect

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 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.

Photonic spin Hall effect in twisted bilayer graphene

2021 ◽  
Author(s):  
Zefeng Chen ◽  
HongWei Yang ◽  
Yihong Xiao ◽  
Jintao Pan ◽  
Yu Xia ◽  
...  
Keyword(s):  
Hall Effect ◽  
Bilayer Graphene ◽  
Spin Hall Effect ◽  
Twisted Bilayer Graphene

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
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