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Evidence for the formation of quasibound states in an asymmetrical quantum point contact

Wu, Phillip LU ; Li, Peng ; Zhang, Hao and Chang, A. M. (2012) In Physical Review B (Condensed Matter and Materials Physics) 85(8).
Abstract
Features below the first conductance plateau in ballistic quantum point contacts (QPCs) are often ascribed to electron interaction and spin effects within the single mode limit. In QPCs with a highly asymmetric geometry, we observe sharp resonance peaks when the point contacts are gated to the single mode regime, and surprisingly, under certain gating conditions, a complete destruction of the 2e(2)/h first quantum plateau. The temperature evolution of the resonances suggest non-Fermi-liquid behavior, while the overall nonlinear characterizations reveal features reminiscent of the 0.7 effect. We attribute these unusual behaviors to the formation of a quasibound state, which is stabilized by a momentum mismatch accentuated by asymmetry.
Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
85
issue
8
article number
085305
publisher
American Physical Society
external identifiers
  • wos:000300091200004
  • scopus:84863264535
ISSN
1098-0121
DOI
10.1103/PhysRevB.85.085305
language
English
LU publication?
yes
id
6c2e5ec1-8dee-4998-9070-9bbd38ca4867 (old id 2409800)
date added to LUP
2016-04-01 14:10:22
date last changed
2025-10-14 11:42:09
@article{6c2e5ec1-8dee-4998-9070-9bbd38ca4867,
  abstract     = {{Features below the first conductance plateau in ballistic quantum point contacts (QPCs) are often ascribed to electron interaction and spin effects within the single mode limit. In QPCs with a highly asymmetric geometry, we observe sharp resonance peaks when the point contacts are gated to the single mode regime, and surprisingly, under certain gating conditions, a complete destruction of the 2e(2)/h first quantum plateau. The temperature evolution of the resonances suggest non-Fermi-liquid behavior, while the overall nonlinear characterizations reveal features reminiscent of the 0.7 effect. We attribute these unusual behaviors to the formation of a quasibound state, which is stabilized by a momentum mismatch accentuated by asymmetry.}},
  author       = {{Wu, Phillip and Li, Peng and Zhang, Hao and Chang, A. M.}},
  issn         = {{1098-0121}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B (Condensed Matter and Materials Physics)}},
  title        = {{Evidence for the formation of quasibound states in an asymmetrical quantum point contact}},
  url          = {{https://lup.lub.lu.se/search/files/3826557/2969471.pdf}},
  doi          = {{10.1103/PhysRevB.85.085305}},
  volume       = {{85}},
  year         = {{2012}},
}