Exact results for the Kondo screening cloud of two helical liquids

Thore Posske, Chao Xing Liu, Jan Carl Budich, Björn Trauzettel

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Abstract

We analyze the screening of a magnetic quantum dot with spin 12 coupled to two helical liquids. Interestingly, we find two qualitatively different sets of Toulouse points, i.e., nontrivial parameters for which we can solve the two channel Kondo model exactly. This enables us to calculate the temperature and voltage dependent Kondo screening cloud, which develops oscillations for an applied spin voltage μs. Such a spin voltage can be conveniently applied by a charge bias in a four-terminal helical liquid setup.

Original languageEnglish (US)
Article number016602
JournalPhysical Review Letters
Volume110
Issue number1
DOIs
StatePublished - Jan 2 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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