TUNNELING AND RESONANT-TUNNELING OF FLUXONS IN A LONG JOSEPHSON-JUNCTION

Citation
A. Shnirman et al., TUNNELING AND RESONANT-TUNNELING OF FLUXONS IN A LONG JOSEPHSON-JUNCTION, Physical review. B, Condensed matter, 56(22), 1997, pp. 14677-14685
Citations number
27
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
01631829
Volume
56
Issue
22
Year of publication
1997
Pages
14677 - 14685
Database
ISI
SICI code
0163-1829(1997)56:22<14677:TAROFI>2.0.ZU;2-8
Abstract
We study fluxon tunneling both across one microshort-type barrier and resonant tunneling across two barriers. We have derived an effective H amiltonian (using the inverse scattering transform) to study the effec t of plasmons on the tunneling. Using a specially derived perturbation scheme, we found two effects:, (1) Emission of plasmons and, hence, s uppression of quantum effects. Due to the gap in the plasmon spectrum, this is an exponentially small effect. (2) Virtual processes involvin g plasmons' emission and absorption cause an enhancement of the tunnel ing probability. The magnitude of this enhancement is not exponentiall y small. We conclude that macroscopic quantum tunneling of fluxons can be observed. We further predict that fluxons' resonant tunneling acro ss two barriers can also be observed. This phenomenon provides an idea l test for the quantum behavior of the fluxons.