title: Exact results for the Kondo screening cloud of two helical liquids.
abstract: We analyze the screening of a magnetic quantum dot with spin 1/2 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 μ(s). Such a spin voltage can be conveniently applied by a charge bias in a four-terminal helical liquid setup.
authors: Institute for Theoretical Physics and Astrophysics, University of Würzburg, 97074 Würzburg, Germany.
authors: Thore
authors: T
authors: Posske
authors: Chao-Xing
authors: CX
authors: Liu
authors: Jan Carl
authors: JC
authors: Budich
authors: Björn
authors: B
authors: Trauzettel