TY - JOUR
T1 - Variational Monte Carlo studies of a t-J model on an anisotropic triangular lattice
AU - Watanabe, Tsutomu
AU - Yokoyama, Hisatoshi
AU - Tanaka, Yukio
AU - Inoue, Jun Ichiro
AU - Ogata, Masao
N1 - Funding Information:
This work is partly supported by Grant-in-Aids from the Ministry of Education, Culture, Sports, Science and Technology, by the Supercomputer Center, ISSP, University of Tokyo, NAREGI Nanoscience Project, Ministry of Education, Culture, Sports, Science and Technology, Japan, which enables us to carry out the calculations on the computers at the Research Center for Computational Science, Okazaki National Research Institutes, and a Grant-in-Aid for the 21st Century COE “Frontiers of Computational Science”.
PY - 2005/10/1
Y1 - 2005/10/1
N2 - 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, using a variational Monte Carlo method. By changing the value of t′/t, we study the stability of superconducting (SC) states with d- and d + id-wave symmetries and of an antiferromagnetic (AF) state. As t′/t decreases from 1, the stable state immediately switches from the d + id wave to the d wave. The AF state is stabilized from the normal spin liquid state for t′/t ≲ 0.7 at half filling. We also take account of Nagaoka ferromagnetism and a phase separation.
AB - 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, using a variational Monte Carlo method. By changing the value of t′/t, we study the stability of superconducting (SC) states with d- and d + id-wave symmetries and of an antiferromagnetic (AF) state. As t′/t decreases from 1, the stable state immediately switches from the d + id wave to the d wave. The AF state is stabilized from the normal spin liquid state for t′/t ≲ 0.7 at half filling. We also take account of Nagaoka ferromagnetism and a phase separation.
KW - Anisotropic triangular lattice
KW - d + id wave
KW - t-J model
KW - Variational Monte Carlo method
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U2 - 10.1016/j.physc.2005.02.042
DO - 10.1016/j.physc.2005.02.042
M3 - Conference article
AN - SCOPUS:25644451991
SN - 0921-4534
VL - 426-431
SP - 289
EP - 294
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - I
T2 - Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity
Y2 - 23 November 2004 through 25 November 2004
ER -