Volume 37, Number 5, February II 1997
|Page(s)||335 - 340|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Exact calculation of thermodynamical quantities of the integrable t-J model
Universität zu Köln, Institut für Theoretische Physik, Zülpicher Str. 77, D-50937, Germany
Accepted: 13 January 1997
The specific heat and the compressibility for the integrable t-J model are calculated showing Luttinger liquid behavior for low temperatures. A Trotter-Suzuki mapping and the quantum transfer matrix approach are utilized. Using an algebraic Bethe ansatz, this method permits the exact calculation of the free energy and related quantities. A set of just two non-linear integral equations determining these quantities is studied for various particle densities and temperatures. The structure of the specific heat is discussed in terms of the elementary charge as well as spin excitations.
PACS: 71.10.Fd – Lattice fermion models / 04.20.Jb – Exact solutions / 05.70.-a – Thermodynamics
© EDP Sciences, 1997
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