SUPERSOLDYNAF

Quantum states in ultracold fermionic gases in optical lattices: Supersolid and dynamic antiferromagnetic states

Coordinatore	MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.    more  Organization address address: Hofgartenstrasse 8 city: MUENCHEN postcode: 80539 contact info Titolo: Ms. Nome: Regina Cognome: Diermann Email: send email Telefono: +49 711 689 1244 Fax: +49 0711 689 1209
Nazionalità Coordinatore	Germany [DE]
Totale costo	217˙477 €
EC contributo	217˙477 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2010-IOF
Funding Scheme	MC-IOF
Anno di inizio	0
Periodo (anno-mese-giorno)	0000-00-00   -   0000-00-00

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	MAX PLANCK GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.  Organization address address: Hofgartenstrasse 8 city: MUENCHEN postcode: 80539 contact info Titolo: Ms. Nome: Regina Cognome: Diermann Email: send email Telefono: +49 711 689 1244 Fax: +49 0711 689 1209	DE (MUENCHEN)	coordinator	217˙477.60

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 Obiettivo del progetto (Objective)

'In recent years the fields of condensed matter physics and ultracold atomic gas physics have developed a fruitful interplay. The former has a long history of describing quantum states of matter based on simplified models, such as the Hubbard model, whilst the latter now manages to simulate these models and generate exciting quantum states. The twofold objective of the research project is to better understand the stability of the supersolid quantum state and the non-adiabatic dynamic generation of antiferromagnetic (AF) quantum states. The supersolid state of matter, a peculiar state with simultaneous crystalline order and superfluid properties, has been proposed to be realizable in a gas of attractive fermions confined to an optical lattice. The research project will theoretically model such a state and analyze its stability. This will be achieved by real space dynamical mean field calculations utilizing the numerical renormalization group as an impurity solver. The second part deals with a correlated fermionic system which by an interaction quench is driven into a situation where a strong AF instability is present. Using the Hubbard model, we will develop and apply non-equilibrium techniques to understand the resulting behavior. A realization of this non-equilibrium situation is possible for an ultracold gas of fermions in an optical lattice with commensurate filling, which is tuned suddenly to the strongly repulsive side of a Feshbach resonance. There, the AF instability competes with processes of molecule formation, which can also occur on this side of the Feshbach resonance. By taking into account both processes we will investigate theoretically the time-dependent response of the system and predict its dominant behavior. Current experiments are performed in regimes very close to the situations described here. The expected experimental realizations within the next years make it a timely and highly relevant research project.'