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Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.72: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Many-body effects for cold atoms in line-centered lattices — •Gediminas Juzeliunas1, Tomas Andrijauskas1, Congjun Wu2, and Maciej Lewenstein3,41Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12, LT-01108 Vilnius, Lithuania — 2Department of Physics, University of California, San Diego, California 92093, USA — 3ICFO-Institut de Ciencies Fotoniques, Parc Mediterrani de la Tecnologia, E-08860 Castelldefels (Barcelona), Spain — 4ICREA - Institucio Catalana de Recerca i Estudis Avancats, 08010 Barcelona, Spain

Recently a line-centered lattice has been proposed and analyzed for cold atoms [1]. A distinguished feature of such a lattice is that its dispersion contains a Dirac cone intersecting with a completely flat band [1]. Here we analyze effects of the atom-atom interaction of the Hubbard type for the line-centered lattice. The lattice is populated by fermionic atoms in two different internal states. We show that there are localized eigen-solutions of the non-interacting Hamiltonian which are preserved by including a sufficiently small atom-atom interaction. The situation resembles to a certain degree the one appearing in the p-band honeycomb lattice in which the interaction takes place between two different atomic p-states [2]. Yet in the present case we are dealing with the s-band of the line-centered lattice, and the interaction takes place between the atoms in different internal states.

[1] R. Shen et al. Phys. Rev. B 81, 041410 (2010). [2] C. Wu et al, Phys. Rev. Lett. 99, 070401 (2007).

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