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Theory of two-dimensional macroscopic quantum tunneling in a Josephson junction coupled with an LC circuit

Shiro Kawabata ; Takeo Kato ; Thilo Bauch (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Journal of Physics: Conference Series Vol. 150 (2009), p. 052105.
[Konferensbidrag, refereegranskat]

We investigate classical thermal activation (TA) and macroscopic quantum tunneling (MQT) for a Josephson junction coupled with an LC circuit theoretically. The TA and MQT escape rate are calculated analytically by taking into account the two-dimensional nature of the classical and quantum phase dynamics. We find that the MQT escape rate is largely suppressed by the coupling to the LC circuit. On the other hand, this coupling gives rise to slight reduction of the TA escape rate. These results are relevant for the interpretation of a recent experiment on the MQT and TA phenomena in grain boundary YBCO Josephson junctions.

Nyckelord: macroscopic quantum tunneling, Josephson junctions, superconductivity



Denna post skapades 2010-01-17. Senast ändrad 2013-10-25.
CPL Pubid: 108194

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik

Ämnesområden

Supraledning
Lågtemperaturfysik

Chalmers infrastruktur