Manifestation of classical bifurcation in the spectrum of the integrable quantum dimer

Details Manifestation of classical bifurcation in the spectrum of the integrable quantum dimer Manifestation of classical bifurcation in the spectrum of the integrable quantum dimer

1998-08-30

arxiv.org/abs/cond-mat/9808332v1

PHYSICAL REVIEW LETTERS, 76(#10)1607-1610 MAR 4,1996

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures, REVTEX

Scientific paper

We analyze the classical and quantum properties of the integrable dimer problem. The classical version exhibits exactly one bifurcation in phase space, which gives birth to permutational symmetry broken trajectories and a separatrix. The quantum analysis yields all tunneling rates (splittings) in leading order of perturbation. In the semiclassical regime the eigenvalue spectrum obtained by numerically exact diagonalization allows to conclude about the presence of a separatrix and a bifurcation in the corresponding classical model.

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