OBSERVATION OF ENERGY-LEVELS QUANTIZATION IN UNDERDAMPED JOSEPHSON-JUNCTIONS ABOVE THE CLASSICAL-QUANTUM REGIME CROSSOVER TEMPERATURE

Authors
SILVESTRINI P PALMIERI VG RUGGIERO B RUSSO M
Citation
P. Silvestrini et al., OBSERVATION OF ENERGY-LEVELS QUANTIZATION IN UNDERDAMPED JOSEPHSON-JUNCTIONS ABOVE THE CLASSICAL-QUANTUM REGIME CROSSOVER TEMPERATURE, Physical review letters, 79(16), 1997, pp. 3046-3049
Citations number
20
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
79
Issue
16
Year of publication
1997
Pages
3046 - 3049
Database
ISI
SICI code
0031-9007(1997)79:16<3046:OOEQIU>2.0.ZU;2-0
Abstract
We present a clear observation of the presence of energy levels quanti zation in high quality Nb-AlOx-Nb underdamped Josephson junctions at t emperatures above the quantum crossover temperature. This has been pos sible by extending the measurements of the escape rate out of the zero -voltage state at higher sweeping frequency (dI/dt up to 25 A/sec) in order to induce nonstationary conditions in the energy potential descr ibing the junction dynamics.