One-dimensional fermions with incommensurate hopping close to dimerization

Details One-dimensional fermions with incommensurate hopping close to dimerization One-dimensional fermions with incommensurate hopping close to dimerization

1998-11-24

arxiv.org/abs/cond-mat/9811330v1

Europhys.Lett. 52 (2000) 337-343

Physics

Condensed Matter

Statistical Mechanics

Revtex, 9 pages including 2 epsf figures

Scientific paper

10.1209/epl/i2000-00444-0

We study the spectrum of fermions hopping on a chain with a weak incommensuration close to dimerization; both q, the deviation of the wave number from pi, and delta, the strength of the incommensuration, are small. For free fermions, we use a continuum Dirac theory to show that there are an infinite number of bands which meet at zero energy as q approaches zero. In the limit that the ratio q/delta ---> 0, the number of states lying inside the q = 0 gap is nonzero and equal to 2 delta / pi^2. Thus the limit q ---> 0 differs from q = 0; this can be seen clearly in the behavior of the specific heat at low temperature. For interacting fermions or the XXZ spin-1/2 chain, we use bosonization to argue that similar results hold.

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