Abstract
The phenomenon of the crossing points in specific-heat curves versus T of the one-dimensional half-filled-band asymmetric Hubbard model is investigated within the method of small-cluster exact-diagonalization calculations with extrapolation techniques to the infinite chain. A definite region where the crossing points occur is found to exist in a certain range of system parameters R (relative magnitude of the transfer integrals) and U (local interaction). We identify an association between crossing point occurrence and gradual localization of fermions.
- Received 10 October 2001
DOI:https://doi.org/10.1103/PhysRevB.65.153109
©2002 American Physical Society