PHASE-DIAGRAM FOR A MODIFIED HARPER MODEL

Authors
DRESE K HOLTHAUS M
Citation
K. Drese et M. Holthaus, PHASE-DIAGRAM FOR A MODIFIED HARPER MODEL, Physical review. B, Condensed matter, 55(22), 1997, pp. 14693-14696
Citations number
19
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
55
Issue
22
Year of publication
1997
Pages
14693 - 14696
Database
ISI
SICI code
0163-1829(1997)55:22<14693:PFAMHM>2.0.ZU;2-7
Abstract
We study a modification of Harper's model that emerges when a modulati on of the hopping integrals is locked to the modulation of the on-site energies, as in the case of ultracold atoms in strongly detuned bichr omatic standing light waves. The modified model is self-dual, so that its phase diagram can be obtained analytically. In this phase diagram there exists an extended region that corresponds to critical states.