Coherent oscillations in small Fermi-polaron systems

Year: 2017

Authors: Tylutki M., Astrakharchik GE., Recati A.

Autors Affiliation: Univ Trento, BEC Ctr, INO CNR, I-38123 Povo, Italy;‎ Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Aalto Univ, Dept Appl Phys, COMP Ctr Excellence, Aalto 00076, Finland;‎ Univ Politecn Cataluna, Dept Fis, ES-08034 Barcelona, Spain; Ludwig Maximilians Univ Munchen, D-80333 Munich, Germany

Abstract: We study the ground state and excitations of a one-dimensional trapped polarized Fermi gas interacting with a single impurity. First, we study the tunneling dynamics of the impurity through a potential barrier, such as one effectively created by a double-well trap. To this end, we perform an exact diagonalization of the full few-body Hamiltonian and analyze the results in a local-density approximation. Off-diagonal and one-particle correlation matrices are studied and are shown to be useful for discerning between different symmetries of the states. Second, we consider a radio-frequency spectroscopy of our system and the resulting spectral function. These calculations can motivate future experiments, which can provide further insight into the physics of a Fermi polaron.

Journal/Review: PHYSICAL REVIEW A

Volume: 96 (6)      Pages from: 063603-1  to: 063603-9

KeyWords: INTERACTING FERMIONS; 1 DIMENSION
DOI: 10.1103/PhysRevA.96.063603

Citations: 19
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