Low-temperature specific heat of the degenerate supersymmetric t-J model in one dimension

Kong Ju Bock Lee, P. Schlottmann

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish
Pages (from-to)6605-6607
Number of pages3
JournalJournal of Applied Physics
Issue number8 PART 2B
StatePublished - 15 Apr 1996


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