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Dynamic structure function of a cold Fermi gas at unitarity

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10.1088/1742-6596/529/1/012009
 
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hdl:2117/26519

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Astrakharchik, GrigoriMés informacióMés informacióMés informació
Boronat Medico, JordiMés informacióMés informacióMés informació
Krotscheck, Eckhard
Lichtenegger, Thomas
Document typeArticle
Defense date2014-08-14
PublisherInstitute of Physics (IOP)
Rights accessOpen Access
Attribution 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution 3.0 Spain
Abstract
We present a theoretical study of the dynamic structure function of a resonantly interacting two-component Fermi gas at zero temperature. Our approach is based on dynamic many-body theory able to describe excitations in strongly correlated Fermi systems. The fixed-node diffusion Monte Carlo method is used to produce the ground-state correlation functions which are used as an input for the excitation theory. Our approach reproduces recent Bragg scattering data in both the density and the spin channel. In the BCS regime, the response is close to that of the ideal Fermi gas. On the BEC side, the Bose peak associated with the formation of dimers dominates the density channel of the dynamic response. When the fraction of dimers is large our theory departs from the experimental data, mainly in the spin channel.
CitationAstrakharchik, G. [et al.]. Dynamic structure function of a cold Fermi gas at unitarity. "Journal of physics: conference series", 14 Agost 2014, vol. 529, núm. 1. 
URIhttp://hdl.handle.net/2117/26519
DOI10.1088/1742-6596/529/1/012009
ISSN1742-6588
Publisher versionhttp://iopscience.iop.org/1742-6596/529/1/012009/pdf/1742-6596_529_1_012009.pdf
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  • Departament de Física i Enginyeria Nuclear (fins octubre 2015) - Articles de revista [603]
  • SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity - Articles de revista [383]
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