Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases

Journal Article · Fri Oct 19 04:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.160403· OSTI ID:21024306

Osterloh, Klaus ^[1]; Barberan, Nuria ^[2]; Lewenstein, Maciej ^[3]

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1. Institute for Theoretical Physics, University of Hannover, Appelstr. 2, D-30167 Hannover (Germany)
2. Dept. ECM, Facultat de Fisica, Universitat de Barcelona, E-08028 Barcelona (Spain)
3. ICFO-Institut de Ciencies Fotoniques, Parc Mediterrani de la Tecnologia (Spain)

We study strongly correlated ground and excited states of rotating quasi-2D Fermi gases constituted of a small number of dipole-dipole interacting particles with dipole moments polarized perpendicular to the plane of motion. As the number of atoms grows, the system enters an intermediate regime, where ground states are subject to a competition between distinct bulk-edge configurations. This effect obscures their description in terms of composite fermions and leads to the appearance of novel quasihole ground states. In the presence of dipolar interactions, the principal Laughlin state at filling {nu}=1/3 exhibits a substantial energy gap for neutral (total angular momentum conserving) excitations and is well-described as an incompressible Fermi liquid. Instead, at lower fillings, the ground state structure favors crystalline order.

• OSTI ID: 21024306
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
DIPOLE MOMENTS
DIPOLES
ENERGY GAP
EXCITATION
EXCITED STATES
FERMI GAS
FERMIONS
GROUND STATES