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Roton-type mode softening in a quantum gas with cavity-mediated long-range interactions

Long-range interactions in quantum gases are predicted to give rise to an excitation spectrum of roton character, similar to that observed in superfluid helium. We investigate the excitation spectrum of a Bose-Einstein condensate with cavity-mediated long-range interactions, which couple all particl... Full description

Journal Title: arXiv.org Sep 28, 2012
Main Author: Mottl, R
Other Authors: Brennecke, F , Baumann, K , Landig, R , Donner, T , Esslinger, T
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: DOI: 10.1126/science.1220314
Zum Text:
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recordid: proquest2086513727
title: Roton-type mode softening in a quantum gas with cavity-mediated long-range interactions
format: Article
creator:
  • Mottl, R
  • Brennecke, F
  • Baumann, K
  • Landig, R
  • Donner, T
  • Esslinger, T
subjects:
  • Phase Transitions
  • Helium
  • Spectrum Analysis
  • Excitation Spectra
  • Helium
  • Superfluidity
  • Softening
  • Fluids
  • Phase Transitions
ispartof: arXiv.org, Sep 28, 2012
description: Long-range interactions in quantum gases are predicted to give rise to an excitation spectrum of roton character, similar to that observed in superfluid helium. We investigate the excitation spectrum of a Bose-Einstein condensate with cavity-mediated long-range interactions, which couple all particles to each other. Increasing the strength of the interaction leads to a softening of an excitation mode at a finite momentum, preceding a superfluid to supersolid phase transition. We study the mode softening spectroscopically across the phase transition using a variant of Bragg spectroscopy. The measured spectrum is in very good agreement with ab initio calculations and, at the phase transition, a diverging susceptibility is observed. The work paves the way towards quantum simulation of long-range interacting many-body systems.
language: eng
source:
identifier: DOI: 10.1126/science.1220314
fulltext: fulltext_linktorsrc
url: Link


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titleRoton-type mode softening in a quantum gas with cavity-mediated long-range interactions
creatorMottl, R ; Brennecke, F ; Baumann, K ; Landig, R ; Donner, T ; Esslinger, T
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identifierDOI: 10.1126/science.1220314
subjectPhase Transitions ; Helium ; Spectrum Analysis ; Excitation Spectra ; Helium ; Superfluidity ; Softening ; Fluids ; Phase Transitions
descriptionLong-range interactions in quantum gases are predicted to give rise to an excitation spectrum of roton character, similar to that observed in superfluid helium. We investigate the excitation spectrum of a Bose-Einstein condensate with cavity-mediated long-range interactions, which couple all particles to each other. Increasing the strength of the interaction leads to a softening of an excitation mode at a finite momentum, preceding a superfluid to supersolid phase transition. We study the mode softening spectroscopically across the phase transition using a variant of Bragg spectroscopy. The measured spectrum is in very good agreement with ab initio calculations and, at the phase transition, a diverging susceptibility is observed. The work paves the way towards quantum simulation of long-range interacting many-body systems.
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descriptionLong-range interactions in quantum gases are predicted to give rise to an excitation spectrum of roton character, similar to that observed in superfluid helium. We investigate the excitation spectrum of a Bose-Einstein condensate with cavity-mediated long-range interactions, which couple all particles to each other. Increasing the strength of the interaction leads to a softening of an excitation mode at a finite momentum, preceding a superfluid to supersolid phase transition. We study the mode softening spectroscopically across the phase transition using a variant of Bragg spectroscopy. The measured spectrum is in very good agreement with ab initio calculations and, at the phase transition, a diverging susceptibility is observed. The work paves the way towards quantum simulation of long-range interacting many-body systems.
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abstractLong-range interactions in quantum gases are predicted to give rise to an excitation spectrum of roton character, similar to that observed in superfluid helium. We investigate the excitation spectrum of a Bose-Einstein condensate with cavity-mediated long-range interactions, which couple all particles to each other. Increasing the strength of the interaction leads to a softening of an excitation mode at a finite momentum, preceding a superfluid to supersolid phase transition. We study the mode softening spectroscopically across the phase transition using a variant of Bragg spectroscopy. The measured spectrum is in very good agreement with ab initio calculations and, at the phase transition, a diverging susceptibility is observed. The work paves the way towards quantum simulation of long-range interacting many-body systems.
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pubCornell University Library, arXiv.org
doi10.1126/science.1220314
urlhttp://search.proquest.com/docview/2086513727/
issue6088
volume336
pages1570-1573
issn00368075
eissn10959203
oafree_for_read
date2012-06-22