@article{ISI:000165233500014,
 abstract = {We study a model 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 assumed to be small. For free fermions, we show that there are an
infinite number of energy bands which meet at zero energy as q
approaches zero. The number of states lying inside the q = 0 gap remains
nonzero as q/delta --> 0. Thus the limit q --> 0 differs from q = 0, as
can be seen clearly in the low-temperature specific heat. For
interacting fermions or the XXZ spin-(1/2) chain, we use bosonization to
argue that similar results hold. Finally, our results can be applied to
the Azbel-Hofstadter problem of particles hopping on a two-dimensional
lattice in the presence of a magnetic field.},
 author = {Sen, D and Lal, S},
 doi = {10.1209/epl/i2000-00444-0},
 issn = {0295-5075},
 journal = {EUROPHYSICS LETTERS},
 month = {NOV},
 number = {3},
 pages = {337-343},
 researcherid-numbers = {Lal, Siddhartha/A-1414-2013},
 times-cited = {10},
 title = {One-dimensional fermions with incommensuration close to dimerization},
 unique-id = {ISI:000165233500014},
 volume = {52},
 year = {2000}
}