Collective Excitations of Rotating Dipolar Fermi Gases in the Fractional Quantum Hall Regime

Details Collective Excitations of Rotating Dipolar Fermi Gases in the Fractional Quantum Hall Regime Collective Excitations of Rotating Dipolar Fermi Gases in the Fractional Quantum Hall Regime

2008-08-04

arxiv.org/abs/0808.0439v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 figures

Scientific paper

We apply the magneto-roton theory of the fractional quantum Hall effect to study the collective excitation spectrum of rotating dipolar Fermi gases. The predicted spectrum has a finite energy gap in the long wavelength limit and a roton minimum at finite wave vector. The roton minimum being deepened from filling factor 1/3 to filling factor 1/5 is a signature of incipient crystallization near filling factor 1/7. We also demonstrate that there are no low-lying single-particle excitations below the roton mode. The fractional-quantum-Hall fluid rotating dipolar fermions behaves as an incompressible superfluid at low temperature.

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