Conductance oscillations in a multi-branch Andreev interferometer
- Authors
- Lee, W.; Lee, Cheol Eui; Choi, B. K.
- Issue Date
- 12월-2007
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- conductance oscillation; Andreev interferometer
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.51, no.6, pp.2019 - 2025
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 51
- Number
- 6
- Start Page
- 2019
- End Page
- 2025
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/125659
- DOI
- 10.3938/jkps.51.2019
- ISSN
- 0374-4884
- Abstract
- The conductance, g(phi), of a comb-shaped N-branch Andreev interferometer is calculated as a function of the phase difference, phi, between the adjacent superconducting order parameters. In the ballistic regime, the scattering matrix theory predicts for the conductivity a typical N-branch interference pattern, that is, a 2 pi-periodic phi dependence with a fine oscillation of the period 2 pi/(N - 1), while for a diffusive system with barriers between the vertices the quasiclassical circuit theory yields a simple 2 pi-periodic conductance regardless of N. With ensemble averaging in the scattering matrix theory, the fine oscillations get washed out, resulting in a simple pi-periodic conductance. In star-shaped interferometers with all the N normal vertices merged into a single vertex, the conductance exhibits similar N-branch interference patterns regardless of whether the conduction is ballistic or diffusive or whether it is ensemble-averaged or not.
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