Phases of thet-Jmodel from variational Monte Carlo studies: Occurrence of time-reversal symmetry breaking
- 1 August 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (4), 2662-2664
- https://doi.org/10.1103/physrevb.42.2662
Abstract
We have numerically evaluated the energy of several kinds of wave functions considered to be candidate ground states of the two-dimensional t-J model at various hole densities. We searched a parameter space which includes d-wave and s-wave superconductivity and spin-density-wave ordering as well as the projected Fermi-liquid state. Coexistence of different orderings, such as the s+id state and d-wave spin-density-wave state, were found to be stable states. We find a phase diagram in the density-t/J plane which has coexistence of antiferromagnetism and superconductivity at very low hole concentrations and superconductivity up to rather high values of density—about 40%. At intermediate concentrations, the time-reversal symmetry-breaking s+id state is found.Keywords
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