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자연과학대학
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Low-temperature specific heat of the degenerate supersymmetric t-J model in one dimension
Title
Low-temperature specific heat of the degenerate supersymmetric t-J model in one dimension
Authors
Lee K.-J.-B.
;
Schlottmann P.
Ewha Authors
이공주복
SCOPUS Author ID
이공주복
Issue Date
1996
Journal Title
Journal of Applied Physics
ISSN
0021-8979
Citation
Journal of Applied Physics vol. 79, no. 8 PART 2B, pp. 6605 - 6607
Indexed
SCI; SCIE; SCOPUS
Document Type
Article
Abstract
We consider the one-dimensional SU(N)-invariant t-J model, which consists of electrons with N spin components on a lattice with nearest-neighbor hopping t constrained by the excluded multiple occupancy of the sites and spin-exchange J between neighboring lattice sites. The model is integrable and has been diagonalized in terms of nested Bethe ansatze at the supersymmetric point t = J. The low-T specific heat is proportional to T. The γ-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 N, band filling, and splitting of the levels (magnetic and crystalline fields). Our results contain the following special cases: (i) For N = 2 the traditional spin-1/2 supersymmetric t-J model, (ii) for exactly one electron per site the SU(N)-Heisenberg chain, and (iii) for N=4 the two-band supersymmetric t-J model with crystalline field splitting. © 1996 American Institute of Physics.
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