dc and ac Josephson effect in a superconductor{endash}Luttinger-liquid{endash}superconductor system
Abstract
We calculate both the dc and the ac Josephson current through a 1-D system of interacting electrons, connected to two superconductors by tunnel junctions. We treat the (repulsive) Coulomb interaction in the framework of the one-channel, spin-1/2 Luttinger model. The Josephson current is obtained for two geometries of experimental relevance: a quantum wire and a ring. At T=0, the critical current is found to decay algebraically with increasing distance {ital d} between the junctions. The decay is characterized by an exponent which depends on the strength of the interaction. At finite temperatures {ital T}, lower than the superconducting transition temperature {ital T}{sub {ital c}}, there is a crossover from algebraic to exponential decay of the critical current as a function of {ital d}, at a distance of the order of {h_bar}{ital v}{sub {ital F}}/{ital k}{sub {ital BT}}. Moreover, the dependence of critical current on temperature shows nonmonotonic behavior. If the Luttinger liquid is confined to a ring of circumference {ital L}, coupled capacitively to a gate voltage and threaded by a magnetic flux, the Josephson current shows remarkable parity effects under the variation of these parameters. For some values of the gate voltage and applied flux, the ring acts asmore »
- Authors:
-
- Institut fuer Theoretische Festkoerperphysik, Universtitaet Karlsruhe, 76128 Karlsruhe (Germany)
- Theoretical Physics Institute, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455 (United States)
- Department of Applied Physics, Delft University of Technology, P.O. Box 5046, 2600 GA Delft (The Netherlands)
- Publication Date:
- OSTI Identifier:
- 282820
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review, B: Condensed Matter
- Additional Journal Information:
- Journal Volume: 53; Journal Issue: 10; Other Information: PBD: Mar 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 66 PHYSICS; SUPERCONDUCTORS; JOSEPHSON EFFECT; COULOMB FIELD; CRITICAL CURRENT; ELECTRON-ELECTRON INTERACTIONS; MAGNETIC FLUX; ONE-DIMENSIONAL CALCULATIONS; TRANSITION TEMPERATURE
Citation Formats
Fazio, R, Istituto di Fisica, Universita di Catania, viale A. Doria 6, 95129 Catania, Hekking, F W, Odintsov, A A, and Nuclear Physics Institute, Moscow State University, Moscow 119899 GSP. dc and ac Josephson effect in a superconductor{endash}Luttinger-liquid{endash}superconductor system. United States: N. p., 1996.
Web. doi:10.1103/PhysRevB.53.6653.
Fazio, R, Istituto di Fisica, Universita di Catania, viale A. Doria 6, 95129 Catania, Hekking, F W, Odintsov, A A, & Nuclear Physics Institute, Moscow State University, Moscow 119899 GSP. dc and ac Josephson effect in a superconductor{endash}Luttinger-liquid{endash}superconductor system. United States. https://doi.org/10.1103/PhysRevB.53.6653
Fazio, R, Istituto di Fisica, Universita di Catania, viale A. Doria 6, 95129 Catania, Hekking, F W, Odintsov, A A, and Nuclear Physics Institute, Moscow State University, Moscow 119899 GSP. 1996.
"dc and ac Josephson effect in a superconductor{endash}Luttinger-liquid{endash}superconductor system". United States. https://doi.org/10.1103/PhysRevB.53.6653.
@article{osti_282820,
title = {dc and ac Josephson effect in a superconductor{endash}Luttinger-liquid{endash}superconductor system},
author = {Fazio, R and Istituto di Fisica, Universita di Catania, viale A. Doria 6, 95129 Catania and Hekking, F W and Odintsov, A A and Nuclear Physics Institute, Moscow State University, Moscow 119899 GSP},
abstractNote = {We calculate both the dc and the ac Josephson current through a 1-D system of interacting electrons, connected to two superconductors by tunnel junctions. We treat the (repulsive) Coulomb interaction in the framework of the one-channel, spin-1/2 Luttinger model. The Josephson current is obtained for two geometries of experimental relevance: a quantum wire and a ring. At T=0, the critical current is found to decay algebraically with increasing distance {ital d} between the junctions. The decay is characterized by an exponent which depends on the strength of the interaction. At finite temperatures {ital T}, lower than the superconducting transition temperature {ital T}{sub {ital c}}, there is a crossover from algebraic to exponential decay of the critical current as a function of {ital d}, at a distance of the order of {h_bar}{ital v}{sub {ital F}}/{ital k}{sub {ital BT}}. Moreover, the dependence of critical current on temperature shows nonmonotonic behavior. If the Luttinger liquid is confined to a ring of circumference {ital L}, coupled capacitively to a gate voltage and threaded by a magnetic flux, the Josephson current shows remarkable parity effects under the variation of these parameters. For some values of the gate voltage and applied flux, the ring acts as a {pi} junction. These features are robust against thermal fluctuations up to temperatures on the order of {h_bar}{ital v}{sub {ital F}}/{ital k}{sub {ital BL}}. For the wire geometry, we have also studied the ac-Josephson effect. The amplitude and the phase of the time-dependent Josephson current are affected by electron-electron interactions. Specifically, the amplitude shows pronounced oscillations as a function of the bias voltage due to the difference between the velocities of spin and charge excitations in the Luttinger liquid. Therefore, the ac-Josephson effect can be used as a tool for the observation of {ital spin}-{ital charge} separation. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevB.53.6653},
url = {https://www.osti.gov/biblio/282820},
journal = {Physical Review, B: Condensed Matter},
number = 10,
volume = 53,
place = {United States},
year = {Fri Mar 01 00:00:00 EST 1996},
month = {Fri Mar 01 00:00:00 EST 1996}
}