Volume 88, Number 2, October 2009
Article Number 20008
Number of page(s) 6
Section General
Published online 05 November 2009
EPL, 88 (2009) 20008
DOI: 10.1209/0295-5075/88/20008

Towards a possible charge Kondo effect in optical lattices

M. S. Laad1, L. Craco2 and A. Taraphder3, 4

1   Lehrstuhl für Theoretische Physik, Technische Universität Dortmund - 44221 Dortmund, Germany, EU
2   Max-Planck-Institut für Chemische Physik fester Stoffe - 01187 Dresden, Germany, EU
3   Department of Physics and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur, 721302 India
4   Max-Planck-Institut für Physik komplexer Systeme - 01187 Dresden, Germany, EU

received 25 August 2009; accepted in final form 24 September 2009; published October 2009
published online 5 November 2009

The Kondo effect underpins a large body of recent developments in the physics of d- and f-band compounds. Although its charge analog is a rarity in solids, the recent observations of the charge Kondo effect and the consequent rise in superconducting Tc encourage a search for other accessible systems. Motivated by the possibility of wilfully tuning the sign of the inter-electronic interaction in optical lattices, we study conditions for the elusive charge Kondo liquid (CKL) state to manifest. We propose that a combination of Feshbach resonances and sequentially controlled laser pulses may produce the CKL. We show that the CKL is never a stable ground state, appearing only when the ordered ground states are destabilized. Finally, we discuss interesting analogies with nuclear matter.

03.75.Ss - Degenerate Fermi gases.
71.10.Fd - Lattice fermion models (Hubbard model, etc.).
71.10.Hf - Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems.

© EPLA 2009