Theory of Macroscopic Quantum Tunneling and Dissipation in High-Tc Josephson Junctions
Shiro Kawabata, Satoshi Kashiwaya, Yasuhiro Asano, Yukio Tanaka, Takeo, Kato, and Alexander A. Golubov
TL;DR
This paper investigates macroscopic quantum tunneling in high-Tc superconductor Josephson junctions, revealing how zero energy bound states cause dissipation and suppress tunneling rates.
Contribution
It provides a theoretical analysis of how ZES and nodal quasiparticles influence MQT in in-plane high-Tc Josephson junctions, highlighting the role of interface states.
Findings
ZES cause strong Ohmic dissipation at interfaces.
MQT rate is suppressed in in-plane junctions with ZES.
Comparison shows c-axis junctions lack ZES and have higher MQT rates.
Abstract
We have investigated macroscopic quantum tunneling (MQT) in in-plane high-Tc superconductor Josephson junctions and the influence of the nodal-quasiparticle and the zero energy bound states (ZES) on MQT. We have shown that the presence of the ZES at the interface between the insulator and the superconductor leads to strong Ohmic quasiparticle dissipation. Therefore, the MQT rate is noticeably suppressed in comparison with the c-axis junctions in which ZES are completely absent.
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