Spin injection from topological insulator tunnel-coupled to metallic leads

P. P. Aseev, S. N. Artemenko

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We study theoretically helical edge states of 2D and 3D topological insulators (TI) tunnel-coupled to metal leads and show that their transport properties are strongly affected by contacts as the latter play a role of a heat bath and induce damping and relaxation of electrons in the helical states of TI. A simple structure that produces a pure spin current in the external circuit is proposed. The current and spin current delivered to the external circuit depend on relation between characteristic lengths: damping length due to tunneling, contact length and, in case of 3D TI, mean free path and spin relaxation length caused by momentum scattering. If the damping length due to tunneling is the smallest one, then the electric and spin currents are proportional to the conductance quantum in 2D TI, and to the conductance quantum multiplied by the ratio of the contact width to the Fermi wavelength in 3D TI.

Original languageEnglish
Pages (from-to)285-288
Number of pages4
JournalJETP Letters
Volume98
Issue number5
DOIs
Publication statusPublished - 1 Nov 2013

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tunnels
insulators
injection
damping
electric current
mean free path
baths
transport properties
momentum
heat
scattering
wavelengths
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Spin injection from topological insulator tunnel-coupled to metallic leads. / Aseev, P. P.; Artemenko, S. N.

In: JETP Letters, Vol. 98, No. 5, 01.11.2013, p. 285-288.

Research output: Contribution to journalArticle

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