期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 33, 期 11, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/abd33a
关键词
Hubbard model; quantum Monte Carlo; electron pairing; magnetism
资金
- Heilongjiang Science Foundation Project [LH2019A011]
- Fundamental Research Funds for the Central Universities
- NSRIF [2019057]
Using the DQMC algorithm, we studied the pairing symmetries of the Hubbard Hamiltonian on square lattices with next-nearest-neighbor hopping t'. We found that d-wave pairing is suppressed by t' while p + ip-wave pairing tends to emerge for low electron density and specific values of t'. By calculating spin correlation functions, we explored the connections between anti-ferromagnetic/ferromagnetic orders and different pairing symmetries.
Using the finite-temperature determinant quantum Monte Carlo (DQMC) algorithm, we study the pairing symmetries of the Hubbard Hamiltonian with next-nearest-neighbor (NNN) hopping t ' on square lattices. By varying the value of t ', we find that the d-wave pairing is suppressed by the onset of t ', while the p + ip-wave pairing tends to emerge for low electron density and t ' around -0.7. Together with the calculation of the anti-ferromagnetic and ferromagnetic spin correlation function, we explore the relationship between anti-ferromagnetic order and the d-wave pairing symmetry, and the relationship between ferromagnetic order and the p + ip-wave pairing symmetry. Our results may be useful for the exploration of the mechanism of the electron pairing symmetries, and for the realization of the exotic p + ip-wave superconductivity.
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