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Roton-Type Mode Softening-in a Quantum Gas with Cavity-Mediated Long-Range Interactions.

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Title: Roton-Type Mode Softening-in a Quantum Gas with Cavity-Mediated Long-Range Interactions.
Authors: Mottl, R., Brennecke, F., Baumann, K., Landig, R., Donner, T., Esslinger, T.
Source: Science (pre-March 2025). 6/22/2012, Vol. 336 Issue 6088, p1570-1573. 4p.
Subjects: Excitation spectrum, Condensation products (Chemistry), Bose-Einstein condensation, Phase transitions, Many-body problem, Atom-atom collisions, Superfluidity, Helium
Abstract: 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 investigated 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 used a variant of Bragg spectroscopy to study the mode softening across the phase transition. The measured spectrum was in very good agreement with ab initio calculations and, at the phase transition, a diverging susceptibility was observed. The work paves the way toward quantum simulation of long-range interacting many-body systems. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Roton-Type Mode Softening-in a Quantum Gas with Cavity-Mediated Long-Range Interactions.
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 6/22/2012, Vol. 336 Issue 6088, p1570-1573. 4p.
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  Data: 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 investigated 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 used a variant of Bragg spectroscopy to study the mode softening across the phase transition. The measured spectrum was in very good agreement with ab initio calculations and, at the phase transition, a diverging susceptibility was observed. The work paves the way toward quantum simulation of long-range interacting many-body systems. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=77688824
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        Value: 10.1126/science.1220314
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      – Code: eng
        Text: English
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      – SubjectFull: Excitation spectrum
        Type: general
      – SubjectFull: Condensation products (Chemistry)
        Type: general
      – SubjectFull: Bose-Einstein condensation
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      – SubjectFull: Phase transitions
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      – SubjectFull: Atom-atom collisions
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      – SubjectFull: Helium
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              Text: 6/22/2012
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