Electronic confinement of surface states in a topological insulator nanowire

Ruchi Saxena, Eytan Grosfeld, Sebastian E De Graaf, Tobias Lindstrom, Floriana Lombardi, Oindrila Deb, Eran Ginossar

Research output: Contribution to journalArticlepeer-review

Abstract

We analyze the confinement of electronic surface states in a model of a topological insulator nanowire. Spin-momentum locking in the surface states reduces unwanted backscattering in the presence of nonmagnetic disorder and is known to counteract localization for certain values of magnetic flux threading the wire. We show that intentional backscattering can be induced for a range of conditions in the presence of a nanowire constriction. We propose a geometry for a nanowire that involves two constrictions and show that these regions form effective barriers that allow for the formation of a quantum dot. We analyze the zero-temperature noninteracting electronic transport through the device using the Landauer-Büttiker approach and show how externally applied magnetic flux parallel to the nanowire and electrostatic gates can be used to control the spectrum of the quantum dot and the electronic transport through the surface states of the model device.

Original languageEnglish
Article number035407
JournalPhysical Review B
Volume106
Issue number3
DOIs
StatePublished - 15 Jul 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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