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Competing phases and suppression of superconductivity in hole-doped Hubbard model on honeycomb lattice |
| Hao Zhang(张浩)1, Shaojun Dong(董少钧)2, and Lixin He(何力新)1,2,3,† |
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2 Institute of Artificial Intelligence, Hefei Comprehensive National Science Center, Hefei 230088, China;
3 Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China |
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Abstract We investigate the hole-doped Hubbard model on a honeycomb lattice using a fermionic projected entangled pair states (fPEPS) method. Our study reveals the presence of quasi-long-range order of Cooper pairs, characterized by power-law decay of correlation functions with exponents $K>1$. We further analyze the competing phases of superconductivity, specifically the antiferromagnetic (AFM) order and the charge density wave (CDW) order. Our results show that there are domain wall structures when the hole doping $\delta$ is small and the Coulomb parameter $U$ is large. However, these structures disappear as we increase the hole doping $\delta$ or decrease $U$. Furthermore, for small hole doping, the system exhibits AFM order, which diminishes for $\delta > 0.05$. Conversely, as the doping level increases, the CDW order gradually decreases. Notably, a considerable CDW order persists even at higher doping levels. These findings suggest a progressive suppression of the AFM order and a growing prominence of the CDW order with increasing $\delta$.
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Received: 24 February 2025
Revised: 09 April 2025
Accepted manuscript online: 10 April 2025
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PACS:
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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74.25.Dw
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(Superconductivity phase diagrams)
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73.22.Pr
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(Electronic structure of graphene)
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02.70.-c
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(Computational techniques; simulations)
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| Fund: We thank Hongchen Jiang for helpful discussion. Project supported by the National Natural Science Foundation of China (Grant Nos. 12134012 and 12104433). |
Corresponding Authors:
Lixin He
E-mail: helx@ustc.edu.cn
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Cite this article:
Hao Zhang(张浩), Shaojun Dong(董少钧), and Lixin He(何力新) Competing phases and suppression of superconductivity in hole-doped Hubbard model on honeycomb lattice 2025 Chin. Phys. B 34 077102
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