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Title · Authors · Abstract · Keywords · DOI · References

Analysis of Graphene Superconducting Properties Based on the t-J-U Model

ZOU Lianjun

(School of Physics and Telecommunication Engineering, Shaanxi University of Technology, Hanzhong 723001, China)

Section：Electronic Engineering · Vol. 2026, Issue 11 · Pages：27-32,36 · 2096-4706（2026）11-0027-07 · CLC number：TP39；O469 · Document code：A · DOI：10.19850/j.cnki.2096-4706.2026.11.006

Abstract

Based on the honeycomb-lattice t-J-U model, this paper employs the renormalized mean-field theory to conduct a systematic study of the unconventional superconducting properties of graphene. By analyzing the effects of different doping concentrations, Coulomb interaction, and antiferromagnetic exchange interaction on superconducting behavior, it is found that the superconducting order parameter exhibits a dome-shaped distribution with respect to hole doping, with the optimal doping located near the van Hove singularity. Meanwhile, enhanced Coulomb repulsion suppresses the double-occupancy state, whereas the antiferromagnetic exchange interaction facilitates superconducting pairing. Under finite-temperature conditions, the superconducting order parameter gradually decreases and eventually vanishes as the temperature increases, and the superfluid weight exhibits a pronounced doping-dependent characteristic. The results indicate that phase fluctuations in two-dimensional systems exert a significant influence on the superconducting critical temperature. This study provides theoretical references for the investigation of the superconducting mechanism in graphene and related two-dimensional materials.

Keywords

t-J-U model; renormalized mean-field theory; graphene; superfluid weight

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About the authors

Zou Lianjun (2001-), male, Han ethnicity, from Fuzhou, Jiangxi Province, is currently pursuing a master's degree in condensed matter physics theory.