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Title: Beyond Linear Response Spectroscopy of Ultracold Fermi Gases

Abstract

We study rf spectroscopy of ultracold Fermi gas by going beyond the linear response in the field-matter interaction. Higher order perturbation theory allows virtual processes and energy conservation beyond the single-particle level. We formulate an effective higher order theory, which agrees quantitatively with experiments on the pairing gap and is consistent with the absence of the mean-field shift in the spin-flip experiment.

Authors:
 [1];  [1];  [2]
  1. Department of Physics, Nanoscience Center, University of Jyvaeskylae, P.O. Box 35, FIN-40014 (Finland)
  2. (Austria)
Publication Date:
OSTI Identifier:
20778642
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 96; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevLett.96.070402; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ENERGY CONSERVATION; FERMI GAS; FERMIONS; MATTER; MEAN-FIELD THEORY; PERTURBATION THEORY; PHOTON-ATOM COLLISIONS; RADIOWAVE RADIATION; SPECTRA; SPECTROSCOPY; SPIN FLIP

Citation Formats

Kinnunen, J., Toermae, P., and Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck. Beyond Linear Response Spectroscopy of Ultracold Fermi Gases. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.96.0.
Kinnunen, J., Toermae, P., & Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck. Beyond Linear Response Spectroscopy of Ultracold Fermi Gases. United States. doi:10.1103/PHYSREVLETT.96.0.
Kinnunen, J., Toermae, P., and Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck. Fri . "Beyond Linear Response Spectroscopy of Ultracold Fermi Gases". United States. doi:10.1103/PHYSREVLETT.96.0.
@article{osti_20778642,
title = {Beyond Linear Response Spectroscopy of Ultracold Fermi Gases},
author = {Kinnunen, J. and Toermae, P. and Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck},
abstractNote = {We study rf spectroscopy of ultracold Fermi gas by going beyond the linear response in the field-matter interaction. Higher order perturbation theory allows virtual processes and energy conservation beyond the single-particle level. We formulate an effective higher order theory, which agrees quantitatively with experiments on the pairing gap and is consistent with the absence of the mean-field shift in the spin-flip experiment.},
doi = {10.1103/PHYSREVLETT.96.0},
journal = {Physical Review Letters},
number = 7,
volume = 96,
place = {United States},
year = {Fri Feb 24 00:00:00 EST 2006},
month = {Fri Feb 24 00:00:00 EST 2006}
}