Evidence of two-dimensional macroscopic quantum tunneling of a current-biased DC-SQUID

Details Evidence of two-dimensional macroscopic quantum tunneling of a current-biased DC-SQUID Evidence of two-dimensional macroscopic quantum tunneling of a current-biased DC-SQUID

2003-08-27

arxiv.org/abs/cond-mat/0308559v1

Phys. Rev. Lett. 91, pp 158301, (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures Accepted to PRL

Scientific paper

10.1103/PhysRevLett.91.158301

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 temperature, 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 (1D) Macroscopic Quantum Tunneling (MQT) law but are perfectly accounted for by the two-dimensional (2D) MQT behaviour as we propose here. Near zero flux, our data confirms the recent MQT observation in a DC-SQUID \cite{Li02}.

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