Valley- and spin-dependent quantum Hall states in bilayer silicene

Thi Nga Do, Godfrey Gumbs, Po Hsin Shih, Danhong Huang, Ming Fa Lin

研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)

摘要

The Hall conductivity σxy of many condensed matter systems presents a step structure when a uniform perpendicular magnetic field is applied. We report the quantum Hall effect in buckled AB-bottom-top bilayer silicene and its robust dependence on the electronic valley and spin-orbit coupling. With the unique multivalley electronic structure and the lack of spin degeneracy, the quantization of the Hall conductivity in this system is unlike the conventional sequence as reported for graphene. Furthermore, the conductivity plateaus take different step values for conduction (2e2/h) and valence (6e2/h) bands since their originating valleys present inequivalent degeneracy. We also report the emergence of fractions under significant effect of a uniform external electric field on the quantum Hall step structure by the separation of orbital distributions and the mixing of Landau levels from distinct valleys. The valley- and spin-dependent quantum Hall conductivity arises from the interplay of lattice geometry, atomic interaction, spin-orbit coupling, and external magnetic and electric fields.

原文English
文章編號155403
期刊Physical Review B
100
發行號15
DOIs
出版狀態Published - 2019 十月 2

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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