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|a Law, Kam Tuen
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|a Lee, Patrick A.
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|a Law, Kam Tuen
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|a Lee, Patrick A.
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|a Lee, Patrick A.
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|a Seng, C. Y.
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|a Ng, Tai-Kai
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|a Quantum dot in a two-dimensional topological insulator: The two-channel Kondo fixed point
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|b American Physical Society,
|c 2010-07-15T18:03:16Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/56577
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|a 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.
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|t Physical Review B
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