Conductance features of core-shell nanowires determined by their internal geometry

Miguel Urbaneja Torres, Anna Sitek, Sigurdur I. Erlingsson, Gunnar Thorgilsson, Vidar Gudmundsson, and Andrei Manolescu
Phys. Rev. B 98, 085419 – Published 13 August 2018

Abstract

We consider electrons in tubular nanowires with prismatic geometry and infinite length. Such a model corresponds to a core-shell nanowire with an insulating core and a conductive shell. In a prismatic shell the lowest energy states are localized along the edges (corners) of the prism and are separated by a considerable energy gap from the states localized on the prism facets. The corner localization is robust in the presence of a magnetic field longitudinal to the wire. If the magnetic field is transversal to the wire the lowest states can be shifted to the lateral regions of the shell, relatively to the direction of the field. These localization effects should be observable in transport experiments on semiconductor core-shell nanowires, typically with hexagonal geometry. We show that the conductance of the prismatic structures considerably differs from the one of circular nanowires. The effects are observed for sufficiently thin hexagonal wires and become much more pronounced for square and triangular shells. To the best of our knowledge, the internal geometry of such nanowires is not revealed in experimental studies. We show that with properly designed nanowires these localization effects may become an important resource of interesting phenomenology.

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  • Received 30 May 2018
  • Revised 27 July 2018

DOI:https://doi.org/10.1103/PhysRevB.98.085419

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Miguel Urbaneja Torres1, Anna Sitek1,2, Sigurdur I. Erlingsson1, Gunnar Thorgilsson1, Vidar Gudmundsson3, and Andrei Manolescu1

  • 1School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland
  • 2Department of Theoretical Physics, Faculty of Fundamental Problems of Technology, Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland
  • 3Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland

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Issue

Vol. 98, Iss. 8 — 15 August 2018

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