The impurity problem in a bilayer system of dipoles

Abstract

We consider a bilayer geometry where a single impurity moves in a two-dimensional plane and is coupled, via dipolar interactions, to a two-dimensional system of fermions residing in the second layer. Dipoles in both layers point in the same direction oriented by an external field perpendicular to the plane of motion. We use quantum Monte Carlo methods to calculate the binding energy and the effective mass of the impurity at zero temperature as a function of the distance between layers as well as of the in-plane interaction strength. In the regime where the fermionic dipoles form a Wigner crystal, the physics of the impurity can be described in terms of a polaron coupled to the bath of lattice phonons. By reducing the distance between layers this polaron exhibits a crossover from a free-moving to a tightly-bound regime where its effective mass is orders of magnitude larger than the bare mass.

5 pages, 5 figures

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Cited by in corpus (8)

• Quantum Monte-Carlo study of the Bose polaron problem in a one-dimensional gas with contact interactions
• Correlation effects and collective excitations in bosonic bilayers: role of quantum statistics, superfluidity and dimerization transition
• Two-dimensional repulsive Fermi polarons with short and long-range interactions
• Universal properties of dipolar Bose polarons in two dimensions
• Pseudopotentials for an ultracold dipolar gas
• Excitonic states of an impurity in a Fermi gas
• Quantum halo states in two-dimensional dipolar clusters
• Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry