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Title: Spin drag and fast response in a quantum mixture of atomic gases
Authors: Carlini, Federico
Stringari, Sandro
Keywords: Science::Physics
Issue Date: 2021
Source: Carlini, F. & Stringari, S. (2021). Spin drag and fast response in a quantum mixture of atomic gases. Physical Review A, 104(2), 023301-1-023301-9.
Journal: Physical Review A 
Abstract: By applying a sudden perturbation to one of the components of a mixture of two quantum fluids, we explore the effect on the motion of the second component on a short time scale. By implementing perturbation theory, we prove that for short times the response of the second component is fixed by the energy weighted moment of the crossed dynamic structure factor (crossed f-sum rule). We also show that by properly monitoring the time duration of the perturbation it is possible to identify peculiar fast spin drag regimes, which are sensitive to the interaction effects in the Hamiltonian. Special focus is given to the case of coherently coupled Bose-Einstein condensates, interacting Bose mixtures exhibiting the Andreev-Bashkin effect, normal Fermi liquids and the polaron problem. The relevant excitations of the system contributing to the spin drag effect are identified and the contribution of the low frequency gapless excitations to the f-sum rule in the density and spin channels is explicitly calculated employing the proper macroscopic dynamic theories. Both spatially periodic and Galilean boost perturbations are considered.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.104.023301
Schools: School of Physical and Mathematical Sciences 
Research Centres: Maju Lab
CNRS International NTU THALES Research Alliances 
Rights: ©2021 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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