Coulomb staircase in an asymmetrically coupled quantum dot

Abstract

We investigate the Coulomb blockade in quantum dots asymmetrically coupled to the leads for an arbitrary voltage bias focusing on the regime where electrons do not thermalise during their dwell time in the dot. By solving the quantum kinetic equation, we show that the current-voltage characteristics are crucially dependent on the ratio of the Fermi energy to charging energy on the dot. In the standard regime when the Fermi energy is large, there is a Coulomb staircase which is practically the same as in the thermalised regime. In the opposite case of the large charging energy, we identify a new regime in which only one step is left in the staircase, and we anticipate experimental confirmation of this finding.

Publication DOI: https://doi.org/10.1088/1361-648X/acede0
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies > Applied Mathematics & Data Science
College of Engineering & Physical Sciences > School of Computer Science and Digital Technologies
Additional Information: Copyright © 2023, The Author(s). Published by IOP Publishing LtdOriginal Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence [https://creativecommons.org/licenses/by/4.0/]. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. The authors gratefully acknowledge support from EPSRC under the Grant EP/R029075/1 (I V L) and from the Leverhulme Trust under the Grant RPG-2019-317 (I V Y).
Uncontrolled Keywords: quantum dots,many-body localisation,non-equilibrium systems,Keldysh techniques,Coulomb blockade
Publication ISSN: 1361-648X
Last Modified: 27 May 2024 07:41
Date Deposited: 04 Sep 2023 16:50
Full Text Link:
Related URLs: https://iopscie ... 361-648X/acede0 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2023-08-29
Published Online Date: 2023-08-29
Accepted Date: 2023-08-07
Authors: McArdle, George
Davies, Rose
Lerner, Igor V
Yurkevich, Igor Valery (ORCID Profile 0000-0003-1447-8913)

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