skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Onset of a Pseudogap Regime in Ultracold Fermi Gases

Abstract

We show, using an ab initio approach based on Quantum Monte Carlo technique, that the pseudogap regime emerges in ultracold Fermi gases close to the unitary point. We locate the onset of this regime at a value of the interaction strength corresponding to (k{sub F}a){sup -1}{approx_equal}-0.05 (a--scattering length). We determine the evolution of the gap as a function of temperature and interaction strength in the Fermi gas around the unitary limit and show that our results exhibit a remarkable agreement with the recent wave-vector resolved radio frequency spectroscopy data. Our results indicate that a finite temperature structure of the Fermi gas around unitarity is more complicated and involves the presence of the phase with preformed Cooper pairs, which, however, do not contribute to the long range order.

Authors:
 [1];  [1];  [2]
  1. Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw (Poland)
  2. Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)
Publication Date:
OSTI Identifier:
21611805
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 14; Other Information: DOI: 10.1103/PhysRevLett.107.145304; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COOPER PAIRS; EVOLUTION; FERMI GAS; INTERACTIONS; MONTE CARLO METHOD; RADIOWAVE RADIATION; SCATTERING LENGTHS; SPECTROSCOPY; TEMPERATURE DEPENDENCE; UNITARITY; VECTORS; CALCULATION METHODS; DIMENSIONS; ELECTROMAGNETIC RADIATION; LENGTH; RADIATIONS; TENSORS

Citation Formats

Magierski, Piotr, Department of Physics, University of Washington, Seattle, Washington 98195-1560, Wlazlowski, Gabriel, and Bulgac, Aurel. Onset of a Pseudogap Regime in Ultracold Fermi Gases. United States: N. p., 2011. Web. doi:10.1103/PHYSREVLETT.107.145304.
Magierski, Piotr, Department of Physics, University of Washington, Seattle, Washington 98195-1560, Wlazlowski, Gabriel, & Bulgac, Aurel. Onset of a Pseudogap Regime in Ultracold Fermi Gases. United States. https://doi.org/10.1103/PHYSREVLETT.107.145304
Magierski, Piotr, Department of Physics, University of Washington, Seattle, Washington 98195-1560, Wlazlowski, Gabriel, and Bulgac, Aurel. Fri . "Onset of a Pseudogap Regime in Ultracold Fermi Gases". United States. https://doi.org/10.1103/PHYSREVLETT.107.145304.
@article{osti_21611805,
title = {Onset of a Pseudogap Regime in Ultracold Fermi Gases},
author = {Magierski, Piotr and Department of Physics, University of Washington, Seattle, Washington 98195-1560 and Wlazlowski, Gabriel and Bulgac, Aurel},
abstractNote = {We show, using an ab initio approach based on Quantum Monte Carlo technique, that the pseudogap regime emerges in ultracold Fermi gases close to the unitary point. We locate the onset of this regime at a value of the interaction strength corresponding to (k{sub F}a){sup -1}{approx_equal}-0.05 (a--scattering length). We determine the evolution of the gap as a function of temperature and interaction strength in the Fermi gas around the unitary limit and show that our results exhibit a remarkable agreement with the recent wave-vector resolved radio frequency spectroscopy data. Our results indicate that a finite temperature structure of the Fermi gas around unitarity is more complicated and involves the presence of the phase with preformed Cooper pairs, which, however, do not contribute to the long range order.},
doi = {10.1103/PHYSREVLETT.107.145304},
url = {https://www.osti.gov/biblio/21611805}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 14,
volume = 107,
place = {United States},
year = {2011},
month = {9}
}