Tunable topological states in electron-doped HTT-Pt

X Zhang, Z Wang, M Zhao, F Liu - Physical Review B, 2016 - APS
Physical Review B, 2016APS
Modulating topologically nontrivial states in trivial materials is of both scientific and
technological interest. Using first-principles calculations, we propose a demonstration of
electron-doping-(or gate-voltage-) induced multiple quantum states; namely, quantum spin
Hall (QSH) and quantum anomalous Hall (QAH) states, in a single material of the
organometallic framework (HTT-Pt) synthesized from triphenylene hexathiol molecules
(HTT) and PtC l 2. At a low doping level, the trivial HTT-Pt converts to a QSH insulator …
Modulating topologically nontrivial states in trivial materials is of both scientific and technological interest. Using first-principles calculations, we propose a demonstration of electron-doping- (or gate-voltage-) induced multiple quantum states; namely, quantum spin Hall (QSH) and quantum anomalous Hall (QAH) states, in a single material of the organometallic framework (HTT-Pt) synthesized from triphenylene hexathiol molecules (HTT) and . At a low doping level, the trivial HTT-Pt converts to a QSH insulator protected by time-reversal symmetry (TRS). When the electronic doping concentration is further increased, TRS will be broken, making the HTT-Pt a QAH insulator. The band gaps of these topologically nontrivial states can be as large as 42.5 meV, suggesting robustness at high temperatures. The possibility of switching between the QSH and QAH states offers an intriguing platform for a different device paradigm by interfacing between QSH and QAH states.
American Physical Society
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