Stochastic dynamics and bound states of heavy impurities in a Fermi bath

Year: 2022

Authors: Sighinolfi M., De Boni D., Roggero A., Garberoglio G., Faccioli P., Recati A.

Autors Affiliation: INO CNR BEC Ctr, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, I-38123 Trento, Italy; Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, I-38123 Trento, Italy; European Ctr Theoret Studies Nucl Phys & Related, I-38123 Trento, Italy.

Abstract: We investigate the dynamics of heavy impurities embedded in an ultracold Fermi gas by using a generalized Langevin equation. The latter – derived by means of influence functional theory – describes how the stochastic classical dynamics of the impurities and the quantum nature of the fermionic bath manifests in the emergent interaction between the impurities and in the viscosity tensor. By focusing on the two-impurity case, we predict the existence of bound states, in different conditions of coupling and temperature, whose lifetime can be analytically estimated. Our predictions should be testable using cold-gases platforms within current technology.

Journal/Review: PHYSICAL REVIEW A

Volume: 105 (4)      Pages from: 043308-1  to: 043308-10

More Information: We thank J. P. Blaizot for useful discussions. Financial support from the Italian MIUR under the PRIN2017 project CEnTraL (Protocol No. 20172H2SC4), from the Provincia Autonoma di Trento, and from Q@TN, the joint laboratory between University of Trento, Fondazione Bruno Kessler (FBK), National Institute for Nuclear Physics (INFN), and National Research Council (CNR), is acknowledged.
KeyWords: Fermi gases; quantum field theory
DOI: 10.1103/PhysRevA.105.043308

ImpactFactor: 2.900
Citations: 2
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