Evidence of Two-Dimensional Macroscopic Quantum Tunneling of a Current-Biased dc SQUID
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© 2003 American Physical Society (APS). http://www.aps.org/
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2003
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Mcode
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Language
en
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158301/1-4
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Physical Review Letters, Volume 91, Issue 15
Abstract
The escape probability out of the superconducting state of a hysteretic dc SQUID has been measured at different values of the applied magnetic flux. At low temperatures, the escape current and the width of the probability distribution are temperature independent but they depend on flux. Experimental results do not fit the usual one-dimensional macroscopic quantum tunneling (MQT) law but are perfectly accounted for by the two-dimensional MQT behavior as we propose here. Near zero flux, our data confirms the recent MQT observation in a dc SQUID [S. Li et al., Phys. Rev. Lett. 89, 98301 (2002)].Description
Keywords
hysteretic dc SQUID, quantum tunneling, conductivity
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Citation
Balestro, F. & Claudon, J. & Pekola, Jukka & Buisson, O. 2003. Evidence of Two-Dimensional Macroscopic Quantum Tunneling of a Current-Biased dc SQUID. Physical Review Letters. Volume 91, Issue 15. 158301/1-4. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.91.158301.