| Autor: |
Mann, Niklas, Bakhtiari, M. Reza, Pelster, Axel, Thorwart, Michael |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Phys. Rev. Lett. 120, 063605 (2018) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.120.063605 |
| Popis: |
We consider a hybrid quantum many-body system formed by both a vibrational mode of a nanomembrane, which interacts optomechanically with light in a cavity, and an ultracold atom gas in the optical lattice of the out-coupled light. After integrating over the light field, an effective Hamiltonian reveals a competition between the localizing potential force and the membrane displacement force. For increasing atom-membrane interaction we find a nonequilibrium quantum phase transition from a localized non-motional phase of the atom cloud to a phase of collective motion. Near the quantum critical point, the energy of the lowest collective excitation vanishes, while the order parameter of the condensate becomes non-zero in the symmetry-broken state. The effect occurs when the atoms and the membrane are non-resonantly coupled. |
| Databáze: |
arXiv |
| Externí odkaz: |
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