scholarly journals Stabilization of the Quantum Spin Hall Effect by Designed Removal of Time-Reversal Symmetry of Edge States

2013 ◽  
Vol 110 (26) ◽  
Author(s):  
Huichao Li ◽  
L. Sheng ◽  
R. Shen ◽  
L. B. Shao ◽  
Baigeng Wang ◽  
...  
Keyword(s):  
Hall Effect ◽  
Time Reversal ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Time Reversal Symmetry ◽  
Edge States ◽  
Quantum Spin Hall Effect ◽  
Quantum Spin Hall

scholarly journals Time-Reversal-Symmetry-Broken Quantum Spin Hall Effect

2011 ◽  
Vol 107 (6) ◽  
Author(s):  
Yunyou Yang ◽  
Zhong Xu ◽  
L. Sheng ◽  
Baigeng Wang ◽  
D. Y. Xing ◽  
...  
Keyword(s):  
Hall Effect ◽  
Time Reversal ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Time Reversal Symmetry ◽  
Quantum Spin Hall Effect ◽  
Quantum Spin Hall

Spin Chern numbers and time-reversal-symmetry-broken quantum spin Hall effect

2013 ◽  
Vol 22 (6) ◽  
pp. 067201 ◽  
Author(s):  
Li Sheng ◽  
Hui-Chao Li ◽  
Yun-You Yang ◽  
Dong-Ning Sheng ◽  
Ding-Yu Xing
Keyword(s):  
Hall Effect ◽  
Time Reversal ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Time Reversal Symmetry ◽  
Quantum Spin Hall Effect ◽  
Chern Numbers ◽  
Quantum Spin Hall

scholarly journals Time-reversal-breaking induced quantum spin Hall effect

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Wei Luo ◽  
D. X. Shao ◽  
Ming-Xun Deng ◽  
W. Y. Deng ◽  
L. Sheng
Keyword(s):  
Hall Effect ◽  
Time Reversal ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Quantum Spin Hall Effect ◽  
Quantum Spin Hall

scholarly journals Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal

Science ◽  
2018 ◽  
Vol 359 (6371) ◽  
pp. 76-79 ◽  
Author(s):  
Sanfeng Wu ◽  
Valla Fatemi ◽  
Quinn D. Gibson ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Hall Effect ◽  
Time Reversal ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Semiconductor Heterostructures ◽  
Topological Phases ◽  
Two Dimensional ◽  
Quantum Spin Hall Effect ◽  
Elastic Backscattering ◽  
Quantum Spin Hall

A variety of monolayer crystals have been proposed to be two-dimensional topological insulators exhibiting the quantum spin Hall effect (QSHE), possibly even at high temperatures. Here we report the observation of the QSHE in monolayer tungsten ditelluride (WTe2) at temperatures up to 100 kelvin. In the short-edge limit, the monolayer exhibits the hallmark transport conductance, ~e2/h per edge, where e is the electron charge and h is Planck’s constant. Moreover, a magnetic field suppresses the conductance, and the observed Zeeman-type gap indicates the existence of a Kramers degenerate point and the importance of time-reversal symmetry for protection from elastic backscattering. Our results establish the QSHE at temperatures much higher than in semiconductor heterostructures and allow for exploring topological phases in atomically thin crystals.

scholarly journals Tunable quantum spin Hall effect via strain in two-dimensional arsenene monolayer

2016 ◽  
Vol 49 (5) ◽  
pp. 055305 ◽  
Author(s):  
Ya-ping Wang ◽  
Chang-wen Zhang ◽  
Wei-xiao Ji ◽  
Run-wu Zhang ◽  
Ping Li ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Two Dimensional ◽  
Quantum Spin Hall Effect ◽  
Quantum Spin Hall

EDGE MAGNETISM AND QUANTUM SPIN HALL EFFECT IN ZIGZAG GRAPHENE NANORIBBON

2013 ◽  
Vol 27 (15) ◽  
pp. 1362011 ◽  
Author(s):  
JUN-WON RHIM ◽  
KYUNGSUN MOON
Keyword(s):  
Electric Field ◽  
Hall Effect ◽  
Graphene Nanoribbon ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Nonmonotonic Dependence ◽  
Quantum Spin Hall Effect ◽  
Edge Spin ◽  
Edge Band ◽  
Quantum Spin Hall

We present here a brief review on the remarkable consequences of the flat bands formed at the edges of the Zigzag graphene nanoribbon (ZGNR). The inclusion of the on-site Coulomb interaction is shown to induce the edge spin ferromagnetism, whose spin stiffness demonstrates a nonmonotonic dependence on the lateral electric field. The critical electric field strength corresponds to that of the insulator to half-metal transition. The inclusion of the spin–orbit coupling (SOC) has been believed to generate the quantum spin Hall effect (QSHE) guiding into the interesting new field of topological insulator. By carefully investigating the SOC near the edge, we have shown that the additional σ-edge band gives a marginal perturbation and hence the existence of the QSHE depends on the coupling strength between the π-edge bands and the σ-edge band. We demonstrate that for the charge neutral ZGNR, the QSHE does not occur in the pristine ZGNR, while the hydrogen passivation along the edge may recover the expected feature of the QSHE.

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