Low-temperature specific heat of the degenerate supersymmetric {ital t}-{ital J} model in one dimension
- Department of Physics, Ewha Womans University, Seoul 120-750, South (Korea)
- Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
We consider the one-dimensional SU({ital N})-invariant {ital t}-{ital J} model, which consists of electrons with {ital N} spin components on a lattice with nearest-neighbor hopping {ital t} constrained by the excluded multiple occupancy of the sites and spin-exchange {ital J} between neighboring lattice sites. The model is integrable and has been diagonalized in terms of nested Bethe ansatze at the supersymmetric point {ital t}={ital J}. The low-{ital T} specific heat is proportional to {ital T}. The {gamma}-coefficient is extracted from the thermodynamic Bethe-ansatz equations and is expressed in terms of the spin wave velocities and the group velocity of the charges for arbitrary {ital N}, band filling, and splitting of the levels (magnetic and crystalline fields). Our results contain the following special cases: (i) For {ital N}=2 the traditional spin-1/2 supersymmetric {ital t}-{ital J} model, (ii) for exactly one electron per site the SU({ital N})-Heisenberg chain, and (iii) for {ital N}=4 the two-band supersymmetric {ital t}-{ital J} model with crystalline field splitting. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 280110
- Report Number(s):
- CONF-951101--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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