Exotic roton excitations in quadrupolar Bose–Einstein condensates
We investigate the occurrence of rotons in a quadrupolar Bose–Einstein condensate confined to two dimensions. Depending on the particle density, the ratio of the contact and quadrupole–quadrupole interactions, and the alignment of the quadrupole moments with respect to the confinement plane, the dis...
| Main Authors: | , , |
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| 格式: | 文件 |
| 语言: | English |
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IOP Publishing
2015-01-01
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| 丛编: | New Journal of Physics |
| 主题: | |
| 在线阅读: | https://doi.org/10.1088/1367-2630/17/4/045005 |
| _version_ | 1827873983676022784 |
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| author | M Lahrz M Lemeshko L Mathey |
| author_facet | M Lahrz M Lemeshko L Mathey |
| author_sort | M Lahrz |
| collection | DOAJ |
| description | We investigate the occurrence of rotons in a quadrupolar Bose–Einstein condensate confined to two dimensions. Depending on the particle density, the ratio of the contact and quadrupole–quadrupole interactions, and the alignment of the quadrupole moments with respect to the confinement plane, the dispersion relation features two or four point-like roton minima or one ring-shaped minimum. We map out the entire parameter space of the roton behavior and identify the instability regions. We propose to observe the exotic rotons by monitoring the characteristic density wave dynamics resulting from a short local perturbation, and discuss the possibilities to detect the predicted effects in state-of-the-art experiments with ultracold homonuclear molecules. |
| first_indexed | 2024-03-12T16:45:48Z |
| format | Article |
| id | doaj.art-acdfdd7419064e7a9be99c9e70a49ecb |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:45:48Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-acdfdd7419064e7a9be99c9e70a49ecb2023-08-08T14:16:10ZengIOP PublishingNew Journal of Physics1367-26302015-01-0117404500510.1088/1367-2630/17/4/045005Exotic roton excitations in quadrupolar Bose–Einstein condensatesM Lahrz0M Lemeshko1L Mathey2Zentrum für Optische Quantentechnologien, Universität Hamburg , 22761 Hamburg, Germany; Institut für Laserphysik, Universität Hamburg , 22761 Hamburg, GermanyIST Austria (Institute of Science and Technology Austria), Am Campus 1, 3400 Klosterneuburg, AustriaZentrum für Optische Quantentechnologien, Universität Hamburg , 22761 Hamburg, Germany; Institut für Laserphysik, Universität Hamburg , 22761 Hamburg, Germany; The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, GermanyWe investigate the occurrence of rotons in a quadrupolar Bose–Einstein condensate confined to two dimensions. Depending on the particle density, the ratio of the contact and quadrupole–quadrupole interactions, and the alignment of the quadrupole moments with respect to the confinement plane, the dispersion relation features two or four point-like roton minima or one ring-shaped minimum. We map out the entire parameter space of the roton behavior and identify the instability regions. We propose to observe the exotic rotons by monitoring the characteristic density wave dynamics resulting from a short local perturbation, and discuss the possibilities to detect the predicted effects in state-of-the-art experiments with ultracold homonuclear molecules.https://doi.org/10.1088/1367-2630/17/4/045005quadrupolar quantumgasquadrupole–quadrupole interactionrotonshomonuclear molecules32.10.Dk67.85.De |
| spellingShingle | M Lahrz M Lemeshko L Mathey Exotic roton excitations in quadrupolar Bose–Einstein condensates New Journal of Physics quadrupolar quantumgas quadrupole–quadrupole interaction rotons homonuclear molecules 32.10.Dk 67.85.De |
| title | Exotic roton excitations in quadrupolar Bose–Einstein condensates |
| title_full | Exotic roton excitations in quadrupolar Bose–Einstein condensates |
| title_fullStr | Exotic roton excitations in quadrupolar Bose–Einstein condensates |
| title_full_unstemmed | Exotic roton excitations in quadrupolar Bose–Einstein condensates |
| title_short | Exotic roton excitations in quadrupolar Bose–Einstein condensates |
| title_sort | exotic roton excitations in quadrupolar bose einstein condensates |
| topic | quadrupolar quantumgas quadrupole–quadrupole interaction rotons homonuclear molecules 32.10.Dk 67.85.De |
| url | https://doi.org/10.1088/1367-2630/17/4/045005 |
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