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Tunneling of hybridized pairs of electrons through a one-dimensional channel

Gumbs, G; Huang, D; Hon, J; Pepper, M; Kumar, S; (2017) Tunneling of hybridized pairs of electrons through a one-dimensional channel. Advances in Physics: X , 2 (3) pp. 545-568. 10.1080/23746149.2017.1326293. Green open access

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Abstract

Recently, the electron transport through a quasi-one dimensional (quasi-1D) electron gas was investigated experimentally as a function of the confining potential. We present a physical model for quantum ballistic transport of electrons through a short conduction channel, and investigate the role played by the Coulomb interaction in modifying the energy levels of two-electron states at low temperatures as the width of the channel is increased. In this regime, the effect of the Coulomb interaction on the two-electron states has been shown to lead to four split energy levels, including two anticrossings and two crossing-level states. Due to the interplay between the anticrossing and crossing of the energy levels, the ground state for the two-electron model switches from one anticrossing state for strong confinement to a crossing state for intermediate confinement as the channel width is first increased, and then returned to its original anticrossing state. This switching behavior is related to the triplet spin degeneracy as well as the Coulomb repulsion and reflected in the ballistic conductance. Here, many-body effects can still affect electron occupations in the calculation of quantum ballistic conductance although it cannot vary the center-of-mass velocity.

Type: Article
Title: Tunneling of hybridized pairs of electrons through a one-dimensional channel
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/23746149.2017.1326293
Publisher version: http://dx.doi.org/10.1080/23746149.2017.1326293
Language: English
Additional information: Copyright © 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Ballistic transport, quasi 1D conductance hybrid clusters PACS: 72.10.-d Theory of electronic transport, scattering mechanisms, 72.20.-i Conductivity phenomena in semiconductors and insulators, 73.21.Hb Quantum wires; 73.23.Ad Ballistic transport
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1568260
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