Evidence for the formation of quasibound states in an asymmetrical quantum point contact
(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:
https://lup.lub.lu.se/record/2409800
- author
- Wu, Phillip LU ; Li, Peng ; Zhang, Hao and Chang, A. M.
- organization
- publishing date
- 2012
- 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
- 2022-01-27 23:12:15
@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}}, }