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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
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Official URL: https://doi.org/10.1088/1361-648X/aaabab
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 | |||||||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| 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: |
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| 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 | |||||||||
| RIOXX Funder/Project Grant: |
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