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Smearing origin of zero-bias conductance peak in Ag-SiO-Bi-2212 planar tunnel junctions: influence of diffusive normal metal verified with the circuit theory
Iduru Shigeta, Yukio Tanaka, Fusao Ichikawa +1
We propose a new approach of smearing origins of a zero-bias conductance peak (ZBCP) in high-Tc superconductor tunnel junctions through the analysis based on the circuit theory for…
Macroscopic quantum dynamics of pi-junctions with ferromagnetic insulators
Shiro Kawabata, Satoshi Kashiwaya, Yasuhiro Asano +2
We theoretically investigate the macroscopic quantum dynamics of a pi junction with a superconductor (S) and a multiferroic material or a ferromagnetic insulator (FI). By deriving…
Anomalous Josephson effect in p-wave dirty junctions
Yasuhiro Asano, Yukio Tanaka, Satoshi Kashiwaya
The Josephson effect in p-wave superconductor / diffusive normal metal / p-wave superconductor junctions is studied theoretically. Amplitudes of Josephson currents are several orde…
Mott Transitions and d-wave Superconductivity in Half-Filled-Band Hubbard Model on Square Lattice with Geometric Frustration
Hisatoshi Yokoyama, Masao Ogata, Yukio Tanaka
Mechanisms of Mott transitions and dx2-y2-wave superconductivity (SC) are studied in the half-filled-band Hubbard model on square lattices with a diagonal hopping term (t'), using…
Charge transport in two dimensional electron gas/superconductor junctions with Rashba spin-orbit coupling
T. Yokoyama, Y. Tanaka, J. Inoue
We have studied the tunneling conductance in two dimensional electron gas / insulator / superconductor junctions in the presence of Rashba spin-orbit coupling (RSOC). It is found t…
Superconductivity and a Mott Transition in a Hubbard Model on an Anisotropic Triangular Lattice
Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka +1
A half-filled-band Hubbard model on an anisotropic triangular lattice (t in two bond directions and t' in the other) is studied using an optimization variational Monte Carlo method…