Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice

doi:10.1088/1674-1056/28/7/077401

中国物理B ›› 2019, Vol. 28 ›› Issue (7): 77401-077401.doi: 10.1088/1674-1056/28/7/077401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice

Xingchuan Zhu(朱兴川), Tao Ying(应涛), Huaiming Guo(郭怀明), Shiping Feng(冯世平)

1 Department of Physics, Beijing Normal University, Beijing 100875, China;
2 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
3 Department of Physics, Key Laboratory of Micro-Nano Measurement-Manipulation and Physics(Ministry of Education), Beihang University, Beijing 100191, China

收稿日期:2019-03-20 修回日期:2019-04-22 出版日期:2019-07-05 发布日期:2019-07-05
通讯作者: Huaiming Guo E-mail:hmguo@buaa.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774019, 11504067, 11574032, and 11734002), the National Key Research and Development Program of China (Grant No. 2016YFA0300304), and the Fundamental Research Funds for the Central Universities, China (Grant No. HIT.NSRIF.2019057).

Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice

Xingchuan Zhu(朱兴川)¹, Tao Ying(应涛)², Huaiming Guo(郭怀明)³, Shiping Feng(冯世平)¹

1 Department of Physics, Beijing Normal University, Beijing 100875, China;
2 Department of Physics, Harbin Institute of Technology, Harbin 150001, China;
3 Department of Physics, Key Laboratory of Micro-Nano Measurement-Manipulation and Physics(Ministry of Education), Beihang University, Beijing 100191, China

Received:2019-03-20 Revised:2019-04-22 Online:2019-07-05 Published:2019-07-05
Contact: Huaiming Guo E-mail:hmguo@buaa.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11774019, 11504067, 11574032, and 11734002), the National Key Research and Development Program of China (Grant No. 2016YFA0300304), and the Fundamental Research Funds for the Central Universities, China (Grant No. HIT.NSRIF.2019057).

摘要/Abstract

摘要：

We perform a systematic determinant quantum Monte Carlo (DQMC) study of the dominating pairing symmetry in a doped honeycomb lattice. The Hubbard model is simulated over a full range of filling levels for both weak and strong interactions. For weak couplings, the d-wave state dominates. The effective susceptibility as a function of filling shows a peak, and its position moves toward half filling as the temperature is increased, from which the optimal filling of the superconducting ground state is estimated. Although the sign problem becomes severe for strong couplings, the simulations access the lowest temperature at which the DQMC method generates reliable results. As the coupling is strengthened, the d-wave state is enhanced in the high-filling region. Our systematic DQMC results provide new insights into the superconducting pairing symmetry in the doped honeycomb lattice.

关键词: determinant quantum Monte Carlo (DQMC) simulation, honeycomb lattice, superconducting pairing symmetry

Abstract:

Key words: determinant quantum Monte Carlo (DQMC) simulation, honeycomb lattice, superconducting pairing symmetry

中图分类号: (Pairing symmetries (other than s-wave))

74.20.Rp

03.65.Vf (Phases: geometric; dynamic or topological) 73.21.Cd (Superlattices)

朱兴川, 应涛, 郭怀明, 冯世平. Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice[J]. 中国物理B, 2019, 28(7): 77401-077401.

Xingchuan Zhu(朱兴川), Tao Ying(应涛), Huaiming Guo(郭怀明), Shiping Feng(冯世平). Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice[J]. Chin. Phys. B, 2019, 28(7): 77401-077401.

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Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice

Quantum Monte Carlo study of the dominating pairing symmetry in doped honeycomb lattice

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