Shot Noise and Coherent Multiple Charge Transfer in Superconducting Quantum Point Contacts
- 17 May 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 82 (20) , 4086-4089
- https://doi.org/10.1103/physrevlett.82.4086
Abstract
We analyze the shot noise in a voltage biased superconducting quantum point contact. Results are presented for the single channel case with arbitrary transmission. In the limit of very low transmission it is found that the effective charge, defined from the noise-current ratio, exhibits a steplike behavior as a function of voltage with well-defined plateaus at integer values of the electronic charge. This multiple charge corresponds to the transmitted charge in a multiple Andreev reflection (MAR) process. This effect gradually disappears for increasing transmission due to interference between different MAR processes.Keywords
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This publication has 15 references indexed in Scilit:
- The signature of chemical valence in the electrical conduction through a single-atom contactNature, 1998
- Observation of Andreev Reflection Enhanced Shot NoisePhysical Review Letters, 1997
- Observation of theFractionally Charged Laughlin QuasiparticlePhysical Review Letters, 1997
- Conduction Channel Transmissions of Atomic-Size Aluminum ContactsPhysical Review Letters, 1997
- Hamiltonian approach to the transport properties of superconducting quantum point contactsPhysical Review B, 1996
- Current noise in biased superconducting weak linksEurophysics Letters, 1996
- ac Josephson Effect in a Single Quantum ChannelPhysical Review Letters, 1995
- Quantum shot noise in a normal-metal–superconductor point contactPhysical Review B, 1994
- Observation of velocity-tuned resonances in the reflection of atoms from an evanescent light gratingPhysical Review A, 1994
- Explanation of subharmonic energy gap structure in superconducting contactsPhysica B+C, 1982