Impurity problem in a bilayer system of dipoles

Year: 2013

Authors: Matveeva N., Giorgini S.

Autors Affiliation: Dipartimento di Fisica, Università di Trento and CNR-INO BEC Center, I-38050 Povo, Trento, Italy

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 111 (22)      Pages from: 220405-1  to: 220405-5

More Information: Useful discussions with G. Astrakharchik and A. Pikovski are gratefully acknowledged. This work has been supported by ERC through the QGBE grant and by Provincia Autonoma di Trento. We thank the AuroraScience project (funded by PAT and INFN) for allocating part of the computing resources for this work and for technical support.
KeyWords: Quantum Monte-carlo; Polarons; State
DOI: 10.1103/PhysRevLett.111.220405

Citations: 8
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