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Phase diagrams of the two-dimensional extended Hubbard model: a comprehensive functional renormalization group study
Arooj Aslam1, Yuan-Yuan Xiang1, Cheng-Wei Li1
1College of Mechanics and Engineering Science, Hohai University, Nanjing, People's Republic of China.
None:
Using the singular-mode functional renormalization group method, we studied the doping-dependent phase diagram of the two-dimensional extended Hubbard model on square lattice. At half-filling, a variety of states strongly compete, including spin-density wave, charge-density wave, phase separation, as well asd-wave ands-wave superconductivity (SC). Upon electron doping, the system exhibits a strong preference for superconducting states. At slight dopings, the spin-density wave phase is strongly suppressed, andd-wave SC region expands into positiveU,Vregion. At moderate dopings, a region of degeneratedp-wave superconductivities emerge for positiveUand negativeV. Our results demonstrate how doping tunes the dominant fluctuations, suppressing density waves and stabilizing unconventional superconducting states in two dimensions.
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