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2015 ; 5
(ä): 14844
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Unusual spin dynamics in topological insulators
#MMPMID26439629
Dóra B
; Simon F
Sci Rep
2015[Oct]; 5
(ä): 14844
PMID26439629
show ga
The dynamic spin susceptibility (DSS) has a ubiquitous Lorentzian form around the
Zeeman energy in conventional materials with weak spin orbit coupling, whose
spectral width characterizes the spin relaxation rate. We show that DSS has an
unusual non-Lorentzian form in topological insulators, which are characterized by
strong SOC, and the anisotropy of the DSS reveals the orientation of the
underlying spin texture of topological states. At zero temperature, the high
frequency part of DSS is universal and increases in certain directions as ?(d-1)
with d?=?2 and 3 for surface states and Weyl semimetals, respectively, while for
helical edge states, the interactions renormalize the exponent as d?=?2K?-?1 with
K the Luttinger-liquid parameter. As a result, spin relaxation rate cannot be
deduced from the DSS in contrast to the case of usual metals, which follows from
the strongly entangled spin and charge degrees of freedom in these systems.