Mixtures of fermionic atoms with mass imbalance in optical lattices

• Authors: Pavol Farkašovský
• Languages of publication: EN

Abstracts

EN

We study ground-state properties of ultracold fermionic mixtures with strong mass imbalance in one and two-dimensional optical lattices through large scale numerical simulations of the attractive Falicov-Kimball model in harmonic confining potentials. In the one-dimensional case, we observe a formation of insulating atomic-density-wave domains at low particle fillings and a coexistence of insulating and metallic domains at intermediate and large particle fillings. Moreover, we show how the formation of metallic regions is reflected in the momentum distribution of the light atoms. In two dimensions, we find a rich spectrum of density-wave patterns including the homogeneous distributions, the axial striped distributions, the labyrinthine phases as well as the segregated phases.

Keywords

EN

optical lattices; Falicov-Kimball model; metal-insulator transitions

Discipline

• 71.10.-w: Theories and models of many-electron systems
• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 05.30.Fk: Fermion systems and electron gas(see also 71.10.-w Theories and models of many-electron systems; see also 67.10.Db Fermion degeneracy in quantum fluids)

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2009
• Volume: 7
• Issue: 1
• Pages: 32-40

Dates

published

1 - 3 - 2009

online

8 - 1 - 2009

Contributors

author

Pavol Farkašovský

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová 47, 040 01, Košice, Slovakia

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Identifiers

DOI

10.2478/s11534-008-0152-8