The evolution of pairing correlation in the anisotropic triangular lattice

Jingyao Wang (), Yamei Zeng (), Peng Wang (), Ying Liang () and Tianxing Ma
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Jingyao Wang: Department of Physics, Beijing Normal University, 19 Xinjiekou Outer St, BeiTaiPingZhuang, Haidian Qu, Beijing 100875, P. R. China
Yamei Zeng: Department of Physics, Beijing Normal University, 19 Xinjiekou Outer St, BeiTaiPingZhuang, Haidian Qu, Beijing 100875, P. R. China
Peng Wang: Department of Physics, Beijing Normal University, 19 Xinjiekou Outer St, BeiTaiPingZhuang, Haidian Qu, Beijing 100875, P. R. China
Ying Liang: Department of Physics, Beijing Normal University, 19 Xinjiekou Outer St, BeiTaiPingZhuang, Haidian Qu, Beijing 100875, P. R. China
Tianxing Ma: Department of Physics, Beijing Normal University, 19 Xinjiekou Outer St, BeiTaiPingZhuang, Haidian Qu, Beijing 100875, P. R. China

International Journal of Modern Physics C (IJMPC), 2017, vol. 28, issue 10, 1-9

Abstract: By using the determined quantum Monte Carlo method, we explore the evolution of the pairing correlation depending on doping and frustration in the two-dimensional Hubbard model on an anisotropic triangular lattice. In the full frustrated system where the nearest hoping term t is equal to the next nearest hoping t′, the dxy-wave pairing dominates over dx2−y2 as the electron filling 〈n〉>1.20. The dx2−y2 superconducting pairing tends to be dominated as the frustration t′∕t decreases, and the decreasing electron fillings also push the system into a possible dx2−y2 superconducting state. Our intensive nonbiased numerical results reveal the competition between dx2−y2 and dxy superconducting pairing states, clarifying the different pairing symmetries in the κ-(BEDT-TTF)2X family of organic charge transfer salts.

Keywords: Pairing symmetry; hubbard model; anisotropic triangular lattice (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0129183117501273

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