Spontaneous inhomogeneous phases in ultracold dipolar Fermi gases

Abstract

We study the collapse of ultracold fermionic gases into inhomogeneous states due to strong dipolar interaction in both 2D and 3D. Depending on the dimensionality, we find that two different types of inhomogeneous states are stabilized once the dipole moment reaches a critical value $d>d_c$: the {\it stripe phase} and {\it phase separation} between high and low densities. In 2D, we prove that the stripe phase is always favored for $d\gtrsim d_c$, regardless of the microscopic details of the system. In 3D, the one-loop perturbative calculation suggests that the same type of instability leads to phase separation. Experimental detection and finite-temperature effects are discussed.

6 pages, 3 figures, new references added

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• Density wave instabilities of tilted fermionic dipoles in a multilayer geometry
• Properties of the density-wave phase of a two-dimensional dipolar Fermi gas
• Dipolar fermions in a two-dimensional lattice at non-zero temperature
• Unconventional Spin Density Waves in Dipolar Fermi Gases
• Ground states of 2D tilted dipolar bosons with density-induced hopping
• Phase-diagram and dynamics of Rydberg-dressed fermions in two-dimensions
• Unconventional symmetries of Fermi liquid and Cooper pairing properties with electric and magnetic dipolar fermions
• Fulde-Ferrell-Larkin-Ovchinnikov state in bilayer dipolar systems
• Phase diagram of two-component dipolar fermions in one-dimensional optical lattices
• Second-order interaction corrections to the Fermi surface and the quasiparticle properties of dipolar fermions in three dimensions
• Finite temperature instabilities of 2D dipolar Bose gas at arbitrary tilt angle
• Electric field-induced clustering in nanocomposite films of highly polarizable inclusions
• Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry