Macroscopic Quantum Tunneling and Quasiparticle Dissipation in d-wave Superconductor Josephson Junctions

Abstract

We examine the macroscopic quantum tunneling (MQT) in high-Tc superconductor Josephson junctions with a d-wave order parameter. Using microscopic Hamiltonian and the functional integral method, we analytically obtain the MQT rate (the inverse lifetime of the metastable state) for the c-axis twist Josephson junctions. In the case of the zero twist angle, the system shows the super-Ohmic dissipation due to the presence of the nodal quasiparticle tunneling. Therefore, the MQT rate is strongly suppressed in compared with the finite twist angle cases.

4 pages, 1 figure, to appear in Phys. Rev. B 70 (2004) No.9

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• Macroscopic quantum tunneling and phase diffusion in a La${}_{2-x}$Sr${}_x$CuO${}_4$ intrinsic Josephson junction stack
• Theory of quantum transport in Josephson junctions with a ferromagnetic insulator
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• Fabrication of submicron La${}_{2-x}$Sr${}_x$CuO${}_4$ intrinsic Josephson junction stacks
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