Charge-spin duality in non-equilibrium transport of helical liquids

Details Charge-spin duality in non-equilibrium transport of helical liquids Charge-spin duality in non-equilibrium transport of helical liquids

2010-08-06

arxiv.org/abs/1008.1195v1

Phys. Rev. B 83, 035407 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages and 3 figures

Scientific paper

Non-equilibrium transport properties of charge and spin sector of two edges of a quantum spin Hall insulator are investigated theoretically in a four-terminal configuration. A simple duality relation between charge and spin sector is found for two helical Tomonaga Luttinger liquids (hTTLs) connected to non-interacting electron reservoirs. If the hTLLs on opposite edges are coupled locally or non-locally, the mixing between them yields interesting physics where spin information can be easily detected by a charge measurement and vice versa. Particularly, we show how a pure spin density in the absence of charge current can be generated in a setup that contains two hTLL and one spinful Tomonaga Luttinger liquid in between.

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