Density wave instability in a 2D dipolar Fermi gas

Abstract

We consider a uniform dipolar Fermi gas in two-dimensions (2D) where the dipole moments of fermions are aligned by an orientable external field. We obtain the ground state of the gas in Hartree-Fock approximation and investigate RPA stability against density fluctuations of finite momentum. It is shown that the density wave instability takes place in a broad region where the system is stable against collapse. We also find that the critical temperature can be a significant fraction of Fermi temperature for a realistic system of polar molecules.

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• Universal behavior of repulsive two-dimensional fermions in the vicinity of the quantum freezing point
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• Thermodynamics of Dipolar Chain Systems
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• Interplay of interlayer pairing and many-body screening in a bilayer of dipolar fermions
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• Dipolar fermions in a multilayer geometry
• Composite quasiparticles in strongly-correlated dipolar Fermi liquids
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• Classical crystal formation of dipoles in two dimensions
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