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Dynamical excitation of maxon and roton modes in a Rydberg-Dressed Bose-Einstein Condensate
- Publication Year :
- 2020
- Publisher :
- arXiv, 2020.
-
Abstract
- We investigate the dynamics of a three-dimensional Bose-Einstein condensate of ultracold atomic gases with a soft-core shape long-range interaction, which is induced by laser dressing the atoms to a highly excited Rydberg state. For a homogeneous condensate, the long-range interaction drastically alters the dispersion relation of the excitation, supporting both roton and maxon modes. Rotons are typically responsible for the creation of supersolids, while maxons are normally dynamically unstable in BECs with dipolar interactions. We show that maxon modes in the Rydberg-dressed condensate, on the contrary, are dynamically stable. We find that the maxon modes can be excited through an interaction quench, i.e. turning on the soft-core interaction instantaneously. The emergence of the maxon modes is accompanied by oscillations at high frequencies in the quantum depletion, while rotons lead to much slower oscillations. The dynamically stable excitation of the roton and maxon modes leads to persistent oscillations in the quantum depletion. Through a self-consistent Bogoliubov approach, we identify the dependence of the maxon mode on the soft-core interaction. Our study shows that maxon and roton modes can be excited dynamically and simultaneously by quenching Rydberg-dressed long-range interactions. This is relevant to current studies in creating and probing exotic states of matter with ultracold atomic gases.<br />Comment: 10 pages, 8 figures
- Subjects :
- Physics
Condensed Matter::Quantum Gases
Condensed Matter::Other
FOS: Physical sciences
Roton
01 natural sciences
010305 fluids & plasmas
law.invention
symbols.namesake
Supersolid
law
Quantum Gases (cond-mat.quant-gas)
Excited state
0103 physical sciences
Rydberg formula
symbols
State of matter
Physics::Atomic Physics
Atomic physics
Rydberg state
010306 general physics
Condensed Matter - Quantum Gases
Quantum
Bose–Einstein condensate
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....89d77e9be27050050e5a82fcfe17add2
- Full Text :
- https://doi.org/10.48550/arxiv.2002.10366