From single-particle excitations to sound waves in a box-trapped atomic Bose-Einstein condensate
| Autor: | Samuel J. Garratt, Nir Navon, Jinyi Zhang, Patrik Turzák, Raphael Lopes, Christoph Eigen, Zoran Hadzibabic, Robert Smith |
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| Přispěvatelé: | Cavendish Laboratory, University of Cambridge [UK] (CAM), Laboratoire Kastler Brossel (LKB [Collège de France]), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)), Clarenton Laboratory, University of Oxford [Oxford], Eigen, Christoph [0000-0001-5298-7482], Hadzibabic, Zoran [0000-0002-0118-9285], Apollo - University of Cambridge Repository |
| Rok vydání: | 2019 |
| Předmět: |
[PHYS.COND.GAS]Physics [physics]/Condensed Matter [cond-mat]/Quantum Gases [cond-mat.quant-gas]
Atomic Physics (physics.atom-ph) Crossover FOS: Physical sciences 01 natural sciences physics.atom-ph Physics - Atomic Physics 010305 fluids & plasmas law.invention quant-ph law 0103 physical sciences Limit (mathematics) 010306 general physics cond-mat.stat-mech Condensed Matter - Statistical Mechanics Sound wave ComputingMilieux_MISCELLANEOUS Physics Condensed Matter::Quantum Gases Quantum Physics Statistical Mechanics (cond-mat.stat-mech) Fluid Dynamics (physics.flu-dyn) Physics - Fluid Dynamics 3. Good health Nonlinear system Amplitude physics.flu-dyn Quantum Gases (cond-mat.quant-gas) Particle Atomic physics Condensed Matter - Quantum Gases Quantum Physics (quant-ph) Bose–Einstein condensate Excitation cond-mat.quant-gas |
| Zdroj: | Physical Review A Physical Review A, American Physical Society 2019, 99 (2), ⟨10.1103/PhysRevA.99.021601⟩ |
| ISSN: | 2469-9926 2469-9934 |
| Popis: | We experimentally and theoretically investigate the lowest-lying axial excitation of an atomic Bose-Einstein condensate in a cylindrical box trap. By tuning the atomic density, we observe how the nature of the mode changes from a single-particle excitation (in the low-density limit) to a sound wave (in the high-density limit). Throughout this crossover the measured mode frequency agrees with Bogoliubov theory. Using approximate low-energy models we show that the evolution of the mode frequency is directly related to the interaction-induced shape changes of the condensate and the excitation. Finally, if we create a large-amplitude excitation, and then let the system evolve freely, we observe that the mode amplitude decays non-exponentially in time; this nonlinear behaviour is indicative of interactions between the elementary excitations, but remains to be quantitatively understood. Comment: 6 pages, 5 figures |
| Databáze: | OpenAIRE |
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