Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases

Details Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases

2007-02-10

arxiv.org/abs/cond-mat/0702266v1

PRL 99,160403 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, paper presented at DPG Meeting 2006, as well as Fritz Haber Institute Colloquium

Scientific paper

10.1103/PhysRevLett.99.160403

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 {\it 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 composite fermion quasi-hole 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.

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