Quantum Monte Carlo study of hole binding and pairing correlations in the three-band Hubbard model
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Department of Physics and Department of Applied Science, College of William and Mary, Williamsburg, Virgina 23187 (United States)
We simulated the three-band Hubbard model using the constrained-path Monte Carlo (CPMC) method in search for a possible superconducting ground state. The CPMC is a ground-state method that is free of the exponential scaling of computing time with system size. We calculated the binding energy of a pair of holes for systems up to 6{times}4 unit cells. We also studied the pairing correlation functions versus distance for both the d-wave and extended s-wave channels in systems up to 6{times}6. We found that holes bind for a wide range of parameters and that the binding increased as the system size is increased. However, the pairing correlation functions decay quickly with distance. For the extended s channel, we found that as the Coulomb interaction U{sub d} on the Cu sites is increased, the long-range part of the correlation functions is suppressed and fluctuates around zero. For the d{sub x{sup 2}{minus}y{sup 2}} channel, we found that the correlations decay rapidly with distance towards a small positive value. However, this value becomes smaller as the interaction U{sub d} or the system size is increased. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 604426
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 19; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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