Fagas, Giorgos and Tkachov, Grygoriy and Pfund, Andreas and Richter, Klaus (2005) Geometrical enhancement of the proximity effect in quantum wires with extended superconducting tunnel contacts. PHYSICAL REVIEW B, 71 (22): 224510. ISSN 1098-0121,
Full text not available from this repository. (Request a copy)Abstract
We study Andreev reflection in a ballistic one-dimensional channel coupled in parallel to a superconductor via a tunnel barrier of finite length L. The dependence of the low-energy Andreev reflection probability R-A on L reveals the existence of a characteristic length scale xi(N) beyond which R-A(L) is enhanced up to unity despite the low interfacial transparency. The Andreev reflection enhancement is due to the strong mixing of particle and hole states that builds up in contacts exceeding the coherence length xi(N), leading to a small energy gap (minigap) in the density of states of the normal system. The role of the geometry of such hybrid contacts is discussed in the context of the experimental observation of zero-bias Andreev anomalies in the resistance of extended carbon nanotube/superconductor junctions in field effect transistor setups.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CARBON NANOTUBES; JOSEPHSON CURRENT; ANDREEV REFLECTION; LUTTINGER-LIQUID; SUBGAP CONDUCTANCE; ELECTRON-GAS; TRANSPORT; JUNCTIONS; BILLIARDS; METAL; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 May 2021 10:46 |
| Last Modified: | 11 May 2021 10:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/36096 |
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