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Title: Dynamic structure factor of a Fermi superfluid in the BEC-BCS crossover

Abstract

We consider cigar-shaped Fermi superfluid in the Bose-Einstein condensation (BEC)-BCS crossover. Using the polytropic form of equation of state, we derive low energy multibranch bosonic excitations and the corresponding density fluctuations in three different regimes along the crossover, namely weak-coupling BCS, unitarity, and molecular BEC regimes. Bragg spectroscopy can be used to probe the multibranch nature of the low-energy bosonic excitations by measuring the dynamic structure factor. Therefore we calculate the dynamic structure factor in those three different regimes. In Bragg spectroscopy, an actual observable is momentum imparted to the superfluid due to the Bragg potential. We also present results of the momentum imparted to the superfluid due to the Bragg pulses.

Authors:
 [1]
  1. Institute for Theoretical Physics, Heinrich-Heine Duesseldorf University, D-40225, Duesseldorf (Germany)
Publication Date:
OSTI Identifier:
21020552
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 76; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.76.033602; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BCS THEORY; BOSE-EINSTEIN CONDENSATION; BRAGG CURVE; COUPLING; EQUATIONS OF STATE; EXCITATION; FERMIONS; FLUCTUATIONS; POTENTIALS; PROBES; PULSES; SPECTROSCOPY; STRUCTURE FACTORS; SUPERFLUIDITY

Citation Formats

Ghosh, Tarun Kanti. Dynamic structure factor of a Fermi superfluid in the BEC-BCS crossover. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.76.033602.
Ghosh, Tarun Kanti. Dynamic structure factor of a Fermi superfluid in the BEC-BCS crossover. United States. https://doi.org/10.1103/PHYSREVA.76.033602
Ghosh, Tarun Kanti. 2007. "Dynamic structure factor of a Fermi superfluid in the BEC-BCS crossover". United States. https://doi.org/10.1103/PHYSREVA.76.033602.
@article{osti_21020552,
title = {Dynamic structure factor of a Fermi superfluid in the BEC-BCS crossover},
author = {Ghosh, Tarun Kanti},
abstractNote = {We consider cigar-shaped Fermi superfluid in the Bose-Einstein condensation (BEC)-BCS crossover. Using the polytropic form of equation of state, we derive low energy multibranch bosonic excitations and the corresponding density fluctuations in three different regimes along the crossover, namely weak-coupling BCS, unitarity, and molecular BEC regimes. Bragg spectroscopy can be used to probe the multibranch nature of the low-energy bosonic excitations by measuring the dynamic structure factor. Therefore we calculate the dynamic structure factor in those three different regimes. In Bragg spectroscopy, an actual observable is momentum imparted to the superfluid due to the Bragg potential. We also present results of the momentum imparted to the superfluid due to the Bragg pulses.},
doi = {10.1103/PHYSREVA.76.033602},
url = {https://www.osti.gov/biblio/21020552}, journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 76,
place = {United States},
year = {2007},
month = {9}
}