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Electrically tunable multiple Dirac cones in thin films of (LaO)2(SbSe2)2 family of materials | | Xiao-Yu Dong
; Jian-Feng Wang
; Rui-Xing Zhang
; Wen-Hui Duan
; Bang-Fen Zhu
; Jorge Sofo
; Chao-Xing Liu
; | | Date: |
12 Sep 2014 | | Abstract: | Two-dimensional Dirac physics has aroused great interests in condensed matter
physics ever since the discovery of graphene and topological insulators due to
its importance in both fundamental physics and device applications. The ability
to control the properties of Dirac cones, such as bandgap and Fermi velocity,
is essential for the occurrence of various new phenomena and the development of
next-generation electronic devices. Based on first-principles calculations and
an analytical effective model, we propose a new Dirac system with eight Dirac
cones in thin films of the (LaO)2(SbSe2)2 family of materials with an external
gate voltage. The advantage of this system lies in its tunability: the
existence of gapless Dirac cones, their positions, Fermi velocities and
anisotropy all can be controlled by an experimentally feasible gate voltage. We
identify the layer dependent spin texture induced by spin-orbit coupling as the
underlying physical reason for the tunability of Dirac cones in this system. As
a consequence, we show that the electrically tunable quantum anomalous Hall
effect with a high Chern number can be induced by introducing magnetization
into this system. | | Source: | arXiv, 1409.3641 | | Services: | Forum | Review | PDF | Favorites | |
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