Thursday, 23 May 2019 at 3:15 pm
McCullough, First Floor Auditorium, Room #115
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.