J. Phys A 30, L711-L717 (1997).
A complete devil s staircase in the Falicov Kimball model
C Micheletti, A B Harris and J M Yeomans
Link to online article.
We consider the neutral, one-dimensional Falicov Kimball
model at zero temperature in the limit of a large electron ion
attractive potential, U. By calculating the general n-ion interaction
terms to leading order in 1/U we argue that the ground state of the
model exhibits the behaviour of a complete devil's staircase.