| Issue |
EPL
Volume 98, Number 6, June 2012
|
|
|---|---|---|
| Article Number | 66002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/98/66002 | |
| Published online | 22 June 2012 | |
Correlated metallic two-particle bound states in quasiperiodic chains
1
Max-Planck Institute for the Physics of Complex Systems - Nöthnitzer Str. 38, 01187 Dresden, Germany, EU
2
Theory of Oscillations Department, University of Nizhniy Novgorod - Nizhniy Novgorod, Russia
3
Physics Department, Tbilisi State University - Chavchavadze 3, 0128 Tbilisi, Georgia
Received:
25
April
2012
Accepted:
25
May
2012
Single-particle states in a chain with quasiperiodic potential show a metal-insulator transition upon the change of the potential strength. We consider two particles with local interaction in the single-particle insulating regime. The two-particle states change from being localized to delocalized upon an increase of the interaction strength to a nonperturbative finite value. At even larger interaction strength the states become localized again. This transition of two-particle bound states into correlated metallic ones is due to a resonant mixing of the noninteracting two-particle eigenstates. In the discovered correlated metal states two particles move coherently together through the whole chain.
PACS: 67.85.-d – Ultracold gases, trapped gases / 37.10.Jk – Atoms in optical lattices / 03.65.Ge – Solutions of wave equations: bound states
© EPLA, 2012
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