标题:Discovery of Two-Dimensional Quantum Spin Hall Effect in Triangular Transition-Metal Carbides
作者:Zhang, Shou-juan; Ji, Wei-xiao; Zhang, Chang-wen; Zhang, Shu-feng; Li, Ping; Li, Sheng-shi; Yan, Shi-shen
作者机构:[Zhang, Shou-juan; Ji, Wei-xiao; Zhang, Chang-wen; Zhang, Shu-feng; Li, Ping] Univ Jinan, Sch Phys & Technol, Jinan 250022, Shandong, Peoples R China. 更多
通讯作者:Zhang, CW;Yan, SS
通讯作者地址:[Zhang, CW]Univ Jinan, Sch Phys & Technol, Jinan 250022, Shandong, Peoples R China;[Yan, SS]Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 更多
来源:CHINESE PHYSICS LETTERS
出版年:2018
卷:35
期:8
DOI:10.1088/0256-307X/35/8/087303
摘要:Though the quantum spin Hall effect (QSHE) in two-dimensional (2D) crystals has been widely explored, the experimental realization of quantum transport properties is only limited to HgTe/CdTe or InAs/GaSb quantum wells. Here we employ a tight-binding model on the basis of d(z2), d(xy), and d(x2-y2) orbitals to propose QSHE in the triangular lattice, which are driven by a crossing of electronic bands at the Gamma point. Remarkably, 2D oxidized Mxenes W2M2C3 are ideal materials with nontrivial gap of 0.12 eV, facilitating room-temperature observations in experiments. We also find that the nontrivially topological properties of these materials are sensitive to the cooperative effect of the electron correlation and spin-orbit coupling. Due to the feasible exfoliation from its 3D MAX phase, our work paves a new direction towards realizing QSHE with low dissipation.
收录类别:SCOPUS;SCIE
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85051604386&doi=10.1088%2f0256-307X%2f35%2f8%2f087303&partnerID=40&md5=7c688bf41211acd3f3491682fc17f84e
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