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Variational Monte Carlo studies of a t-J model on an anisotropic triangular lattice
Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka +2
With the insulating phase of κ-(BEDT-TTF)_2X in mind, we study a t-J model on an anisotropic triangular lattice, where the hopping integral is t' in one of the three directions, us…
Theory of enhanced proximity effect by mid gap Andreev resonant state in diffusive normal metal / triplet superconductor junctions
Y. Tanaka, S. Kashiwaya, T. Yokoyama
Enhanced proximity effect by mid gap Andreev resonant state (MARS) in a diffusive normal metal / insulator / triplet superconductor (DN/TS) junction is studied based on the Keldysh…
Quasiparticle Dissipation in d-wave Superconductor Phase Qubit
Shiro Kawabata, Satoshi Kashiwaya, Yasuhiro Asano +1
Recent phase sensitive experiments on high Tc superconductors, e.g., YBa_2Cu_3O_7 single crystals, have established the d-wave nature of the cuprate materials. Here we discuss how…
Variational Monte Carlo Studies of Pairing Symmetry for the t-J Model on a Triangular Lattice
Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka +2
As a model of a novel superconductor Na_xCoO_2\cdotyH_2O, a single-band t-J model on a triangular lattice is studied, using a variational Monte Carlo method. We calculate the energ…
Competition between singlet and triplet pairings in Na_xCoO_2 yH_2O
Kazuhiko Kuroki, Yukio Tanaka, Ryotaro Arita
We discuss the pairing symmetry of a cobaltate superconductor NaCoO HO by adopting an effective single band model that takes into account the hole pockets…
Macroscopic Quantum Tunneling and Quasiparticle Dissipation in d-wave Superconductor Josephson Junctions
Shiro Kawabata, Satoshi Kashiwaya, Yasuhiro Asano +1
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 int…