A Bethe ansatz solvable model for superpositions of Cooper pairs and condensed molecular bosons

Hibberd, K. E., Dunning, C. and Links, J. (2006) A Bethe ansatz solvable model for superpositions of Cooper pairs and condensed molecular bosons. Nuclear Physics B, 748 3: 458-472.


Author Hibberd, K. E.
Dunning, C.
Links, J.
Title A Bethe ansatz solvable model for superpositions of Cooper pairs and condensed molecular bosons
Journal name Nuclear Physics B   Check publisher's open access policy
ISSN 0550-3213
Publication date 2006
Sub-type Article (original research)
DOI 10.1016/j.nuclphysb.2006.04.026
Volume 748
Issue 3
Start page 458
End page 472
Total pages 15
Editor Altarelli, G.
Bartel. W.
Place of publication Netherlands
Publisher Elsevier
Collection year 2006
Language eng
Subject C1
230199 Mathematics not elsewhere classified
240200 Theoretical and Condensed Matter Physics
230105 Group Theory And Generalisations (Incl. Topological Groups And Lie Groups)
780101 Mathematical sciences
010502 Integrable Systems (Classical and Quantum)
Abstract We introduce a general Hamiltonian describing coherent superpositions of Cooper pairs and condensed molecular bosons. For particular choices of the coupling parameters, the model is integrable. One integrable manifold, as well as the Bethe ansatz solution, was found by Dukelsky et al. [J. Dukelsky, G.G. Dussel, C. Esebbag, S. Pittel, Phys. Rev. Lett. 93 (2004) 050403]. Here we show that there is a second integrable manifold, established using the boundary quantum inverse scattering method. In this manner we obtain the exact solution by means of the algebraic Bethe ansatz. In the case where the Cooper pair energies are degenerate we examine the relationship between the spectrum of these integrable Hamiltonians and the quasi-exactly solvable spectrum of particular Schrodinger operators. For the solution we derive here the potential of the Schrodinger operator is given in terms of hyperbolic functions. For the solution derived by Dukelsky et al., loc. cit. the potential is sextic and the wavefunctions obey PT-symmetric boundary conditions. This latter case provides a novel example of an integrable Hermitian Hamiltonian acting on a Fock space whose states map into a Hilbert space of PE-symmetric wavefunctions defined on a contour in the complex plane. (c) 2006 Elsevier B.V. All rights reserved.
Keyword Physics, Particles & Fields
Symmetric Quantum-mechanics
Bose-einstein Condensate
Reflection Equation
Systems
Hamiltonians
Potentials
Algebras
Boundary
Spectra
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 10:14:56 EST