Quantum dot in a two-dimensional topological insulator: The two-channel Kondo fixed point
Name
Law-2010-Quantum dot in a two-dimensional topological insulator The two-channel Kondo fixed point.pdf
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Author(s)
Law, Kam Tuen
Lee, Patrick A.
Seng, C. Y.
Ng, Tai-Kai
Date Issued
January 2010
Journal
Physical Review B
Publisher
American Physical Society
Citation
Law, K. T. et al. “Quantum dot in a two-dimensional topological insulator: The two-channel Kondo fixed point.” Physical Review B 81.4 (2010): 041305. © 2010 American Physical Society.
Version
Final published version
Abstract
A quantum dot coupled to two helical edge states of a two-dimensional topological insulator through
electron tunnelings is studied. We show that if the electron interactions on the edge states are repulsive, with
Luttinger liquid parameter K<1, the system reaches a stable two-channel Kondo fixed point at low temperatures.
This is in contrast to the Luttinger liquid leads case in which K<1/2 is needed. This two-channel fixed
point is described by a boundary sine-Gordon Hamiltonian with a K dependent boundary term. The impurity
entropy, the impurity specific heat and the conductance are calculated.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevB.81.041305
