Saxena, R; Grosfeld, E; de Graaf, S E; Lindstrom, T; Lombardi, F; Deb, O; Ginossar, E (2022) Electronic confinement of the surface states in a topological insulator nanowire. Physical Review B, 106. 035407

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Abstract

We analyze the confinement of electronic surface states in a model of a topological insulator nanowire (TINW). Spin-momentum locking in the surface states reduces unwanted backscattering in the presence of non-magnetic disorder and is known to counteract localization for certain values of magnetic flux threading along 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 TINW that involves two constrictions and argue that these regions form effective barriers that allow for the formation of a quantum dot. We analyze the zero-temperature non-interacting electronic transport through the device using the Landauer-Buttiker approach and show how externally applied magnetic ux parallel to the nanowire and electrostatic gates can be used to control the spectrum of the quantum dot and electronic transport through the surface states of the model device.

Item Type:	Article
Keywords:	Topological insulators, charge confinement, charge pumping, nanodevices
Subjects:	Quantum Phenomena > Quantum Information Processing and Communication
Divisions:	Quantum Technologies
Identification number/DOI:	10.1103/PhysRevB.106.035407
Last Modified:	12 Sep 2022 13:04
URI:	https://eprintspublications.npl.co.uk/id/eprint/9511