Formation of a non-magnetic, odd-denominator fractional quantized conductance in a quasi-one-dimensional electron system

Abstract

We have investigated the transport properties of a two-dimensional electron gas confined to one dimension by voltages applied to a pair of split gates and an additional top gate deposited on the surface of the GaAs/AlGaAs heterostructure. At low carrier concentrations, <5 × 1010 cm−2, in a wide 1D channel (700 nm), with an asymmetric confinement potential, the conductance plateaux in units of e2/h at 1 and 2/3 were observed. In the presence of a fixed in-plane magnetic field of 10 T, additional plateaux at 2/5 and 2/7 appeared with increasing asymmetry in confinement potential. The appearance of odd-denominator fractional states seems to originate from the zigzag formed when electrons are allowed to relax in the second dimension at the boundary of the 1D-2D transition.

Metadata

Authors/Creators:	Kumar, S. Pepper, M. Ritchie, D. Farrer, I. https://orcid.org/0000-0002-3033-4306 Montagu, H.
Copyright, Publisher and Additional Information:	© 2019 Author(s). Reproduced in accordance with the publisher's self-archiving policy.
Dates:	Accepted: 27 August 2019 Published (online): 18 September 2019 Published: 16 September 2019
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	13 Nov 2019 10:42
Last Modified:	18 Sep 2020 00:38
Status:	Published
Publisher:	AIP Publishing
Refereed:	Yes
Identification Number:	https://doi.org/10.1063/1.5121147
Related URLs:	Author

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Formation of a non-magnetic, odd-denominator fractional quantized conductance in a quasi-one-dimensional electron system

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