Bibliographic Details
| 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] |
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| Database: |
Psychology and Behavioral Sciences Collection |
