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Title: Conductance of a helical edge liquid coupled to a magnetic impurity.

Abstract

Transport in an ideal two-dimensional quantum spin Hall device is dominated by the counterpropagating edge states of electrons with opposite spins, giving the universal value of the conductance, 2e{sup 2}/h. We study the effect on the conductance of a magnetic impurity, which can backscatter an electron from one edge state to the other. In the case of isotropic Kondo exchange we find that the correction to the electrical conductance caused by such an impurity vanishes in the dc limit, while the thermal conductance does acquire a finite correction due to the spin-flip backscattering.

Authors:
; ;  [1];  [2]
  1. (Materials Science Division)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Postdoctural Research - RIKEN; JSPS - Japan
OSTI Identifier:
1016468
Report Number(s):
ANL/MSD/JA-69524
Journal ID: 0031-9007; TRN: US201112%%350
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. Lett.
Additional Journal Information:
Journal Volume: 106; Journal Issue: Jun. 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BACKSCATTERING; ELECTRONS; SPIN; SPIN FLIP; TRANSPORT

Citation Formats

Tanaka, Y., Furusaki, A., Matveev, K. A., and RIKEN). Conductance of a helical edge liquid coupled to a magnetic impurity.. United States: N. p., 2011. Web. doi:10.1103/PhysRevLett.106.236402.
Tanaka, Y., Furusaki, A., Matveev, K. A., & RIKEN). Conductance of a helical edge liquid coupled to a magnetic impurity.. United States. doi:10.1103/PhysRevLett.106.236402.
Tanaka, Y., Furusaki, A., Matveev, K. A., and RIKEN). Wed . "Conductance of a helical edge liquid coupled to a magnetic impurity.". United States. doi:10.1103/PhysRevLett.106.236402.
@article{osti_1016468,
title = {Conductance of a helical edge liquid coupled to a magnetic impurity.},
author = {Tanaka, Y. and Furusaki, A. and Matveev, K. A. and RIKEN)},
abstractNote = {Transport in an ideal two-dimensional quantum spin Hall device is dominated by the counterpropagating edge states of electrons with opposite spins, giving the universal value of the conductance, 2e{sup 2}/h. We study the effect on the conductance of a magnetic impurity, which can backscatter an electron from one edge state to the other. In the case of isotropic Kondo exchange we find that the correction to the electrical conductance caused by such an impurity vanishes in the dc limit, while the thermal conductance does acquire a finite correction due to the spin-flip backscattering.},
doi = {10.1103/PhysRevLett.106.236402},
journal = {Phys. Rev. Lett.},
number = Jun. 2011,
volume = 106,
place = {United States},
year = {2011},
month = {6}
}