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2015 ; 5
(ä): 10997
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Universal Conductance Fluctuation in Two-Dimensional Topological Insulators
#MMPMID26055574
Choe DH
; Chang KJ
Sci Rep
2015[Jun]; 5
(ä): 10997
PMID26055574
show ga
Despite considerable interest in two-dimensional (2D) topological insulators
(TIs), a fundamental question still remains open how mesoscopic conductance
fluctuations in 2D TIs are affected by spin-orbit interaction (SOI). Here, we
investigate the effect of SOI on the universal conductance fluctuation (UCF) in
disordered 2D TIs. Although 2D TI exhibits UCF like any metallic systems, the
amplitude of these fluctuations is distinguished from that of conventional
spin-orbit coupled 2D materials. Especially, in 2D systems with mirror symmetry,
spin-flip scattering is forbidden even in the presence of strong intrinsic SOI,
hence increasing the amplitude of the UCF by a factor of ?2 compared with
extrinsic SOI that breaks mirror symmetry. We propose an easy way to
experimentally observe the existence of such spin-flip scattering in 2D
materials. Our findings provide a key to understanding the emergence of a new
universal behavior in 2D TIs.