Dynamical pair susceptibilities in thet-Jand Hubbard models
- 1 August 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (4), 2347-2352
- https://doi.org/10.1103/physrevb.42.2347
Abstract
We study dynamical properties of two holes in the t-J, t-, and Hubbard models using exact diagonalization techniques on small clusters. For the three models we found that the ground state of two holes has d-wave symmetry. Studying the dynamical d-wave pairing susceptibility at zero momentum, we observed a quasiparticle-like peak at the bottom of the spectrum in a broad region of parameter space. The lowest-energy p-wave state is close in energy to the d-wave ground state, and they both behave qualitatively similarly, while the lowest-energy states of the s-wave and extended-s-wave subspaces have higher energies and present no quasiparticle peak. The ground-state energy of two holes in the t-J model scales with J as a power law. Binding energies for different symmetries as well as dynamical properties for nonzero momentum are also discussed.
Keywords
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