Theory of macroscopic quantum tunneling in high-Tc c-axis Josephson junctions
Takehito Yokoyama, Shiro Kawabata, Takeo Kato, Yukio Tanaka
DOI 10.1103/PhysRevB.76.134501 · Physical Review B
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Abstract
We study macroscopic quantum tunneling (MQT) in c-axis twist Josephson junctions made of high-Tc superconductors in order to clarify the influence of the anisotropic order parameter symmetry (OPS) on MQT. The dependence of the MQT rate on the twist angle γ about the c axis is calculated by using the functional integral and the bounce method. Due to the d-wave OPS, the γ dependence of standard deviation of the switching current distribution and the crossover temperature from thermal activation to MQT are found to be given by cos2γ and cos2γ, respectively. We also show that a dissipative effect resulting from the nodal quasiparticle excitation on MQT is negligibly small, which is consistent with recent MQT experiments using Bi2Sr2CaCu2O8+δ intrinsic junctions. These results indicate that MQT in c-axis twist junctions becomes a useful experimental tool for testing the OPS of high-Tc materials at low temperature, and suggest high potential of such junctions for qubit applications.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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