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Thursday, 23 May 2019 at 3:15 pm

McCullough, First Floor Auditorium, Room #115


Host:Srinivas Raghu 


Hong-Chen Jiang

Stanford University and SLAC National Accelerator Laboratory


Superconductivity in the doped t-J and Hubbard models on the square lattice

The Hubbard model, and the closely related t-J model, play central roles in the theory of high-temperature superconductivity. Enormous effort has been devoted to studying the properties of these models at intermediate couplings, however, a general consensus is still not present yet. In this talk, we will address this problem by studying the lightly doped t-J and Hubbard models on 4-leg cylinders on the square lattice. Based on large-scale DMRG simulation, we are able to investigate the interplay between superconductivity, spin and charge-density-wave orders. Our results suggest that the long-distance behavior is consistent with that of a Luther-Emery liquid with power-law charge-density-wave and superconducting correlations but with a gap in the spin sector. The whole ground state phase diagram will also be discussed.