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Self-organised fractional quantisation in a hole quantum wire

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Gul, Yilmaz, Holmes, Stuart N., Myronov, Maksym, Kumar, Sanjeev and Pepper, Michael (2018) Self-organised fractional quantisation in a hole quantum wire. Journal of Physics: Condensed Matter, 30 (9). 09LT01. doi:10.1088/1361-648X/aaabab ISSN 0953-8984.

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Official URL: https://doi.org/10.1088/1361-648X/aaabab

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Abstract

We have investigated hole transport in quantum wires formed by electrostatic confinement in strained germanium two-dimensional layers. The ballistic conductance characteristics show the regular staircase of quantum levels with plateaux at n2e2/h, where n is an integer, e is the fundamental unit of charge and h is Planck's constant. However as the carrier concentration is reduced, the quantised levels show a behaviour that is indicative of the formation of a zig-zag structure and new quantised plateaux appear at low temperatures. In units of 2e2/h the new quantised levels correspond to values of n = 1/4 reducing to 1/8 in the presence of a strong parallel magnetic field which lifts the spin degeneracy but does not quantise the wavefunction. A further plateau is observed corresponding to n = 1/32 which does not change in the presence of a parallel magnetic field. These values indicate that the system is behaving as if charge was fractionalised with values e/2 and e/4, possible mechanisms are discussed. [Abstract copyright: © 2018 IOP Publishing Ltd.]

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Nanowires, Exciton theory, Germanium
Journal or Publication Title: Journal of Physics: Condensed Matter
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0953-8984
Official Date: 30 January 2018
Dates:
DateEvent
30 January 2018Available
30 January 2018Accepted
Volume: 30
Number: 9
Article Number: 09LT01
DOI: 10.1088/1361-648X/aaabab
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 30 January 2020
Date of first compliant Open Access: 30 January 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/K004077/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/J003263/1University of Warwickhttp://dx.doi.org/10.13039/501100000741
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