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Dynamic Onset of Feynman Relation in the Phonon Regime

The Feynman relation, a much celebrated condensed matter physics gemstone for more than 70 years, predicts that the density excitation spectrum and structure factor of a condensed Bosonic system in the phonon regime drops linear and continuously to zero. Until now, this widely accepted monotonic exc...

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Autores principales: Li, Y., Zhu, C. J., Hagley, E. W., Deng, L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4860570/
https://www.ncbi.nlm.nih.gov/pubmed/27157438
http://dx.doi.org/10.1038/srep25690
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author Li, Y.
Zhu, C. J.
Hagley, E. W.
Deng, L.
author_facet Li, Y.
Zhu, C. J.
Hagley, E. W.
Deng, L.
author_sort Li, Y.
collection PubMed
description The Feynman relation, a much celebrated condensed matter physics gemstone for more than 70 years, predicts that the density excitation spectrum and structure factor of a condensed Bosonic system in the phonon regime drops linear and continuously to zero. Until now, this widely accepted monotonic excitation energy drop as the function of reduced quasi-momentum has never been challenged in a spin-preserving process. We show rigorously that in a light-matter wave-mixing process in a Bosonic quantum gas, an optical-dipole potential arising from the internally-generated field can profoundly alter the Feynman relation and result in a new dynamic relation that exhibits an astonishing non-Feynman-like onset and cut-off in the excitation spectrum of the ground state energy of spin-preserving processes. This is the first time that a nonlinear optical process is shown to actively and significantly alter the density excitation response of a quantum gas. Indeed, this dynamic relation with a non-Feynman onset and cut-off has no correspondence in either nonlinear optics of a normal gas or a phonon-based condensed matter Bogoliubov theory.
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spelling pubmed-48605702016-05-20 Dynamic Onset of Feynman Relation in the Phonon Regime Li, Y. Zhu, C. J. Hagley, E. W. Deng, L. Sci Rep Article The Feynman relation, a much celebrated condensed matter physics gemstone for more than 70 years, predicts that the density excitation spectrum and structure factor of a condensed Bosonic system in the phonon regime drops linear and continuously to zero. Until now, this widely accepted monotonic excitation energy drop as the function of reduced quasi-momentum has never been challenged in a spin-preserving process. We show rigorously that in a light-matter wave-mixing process in a Bosonic quantum gas, an optical-dipole potential arising from the internally-generated field can profoundly alter the Feynman relation and result in a new dynamic relation that exhibits an astonishing non-Feynman-like onset and cut-off in the excitation spectrum of the ground state energy of spin-preserving processes. This is the first time that a nonlinear optical process is shown to actively and significantly alter the density excitation response of a quantum gas. Indeed, this dynamic relation with a non-Feynman onset and cut-off has no correspondence in either nonlinear optics of a normal gas or a phonon-based condensed matter Bogoliubov theory. Nature Publishing Group 2016-05-09 /pmc/articles/PMC4860570/ /pubmed/27157438 http://dx.doi.org/10.1038/srep25690 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Li, Y.
Zhu, C. J.
Hagley, E. W.
Deng, L.
Dynamic Onset of Feynman Relation in the Phonon Regime
title Dynamic Onset of Feynman Relation in the Phonon Regime
title_full Dynamic Onset of Feynman Relation in the Phonon Regime
title_fullStr Dynamic Onset of Feynman Relation in the Phonon Regime
title_full_unstemmed Dynamic Onset of Feynman Relation in the Phonon Regime
title_short Dynamic Onset of Feynman Relation in the Phonon Regime
title_sort dynamic onset of feynman relation in the phonon regime
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4860570/
https://www.ncbi.nlm.nih.gov/pubmed/27157438
http://dx.doi.org/10.1038/srep25690
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