Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/4991
Title: Dynamical excitation of maxon and roton modes in a Rydberg-dressed Bose-Einstein condensate
Authors: McCormack, Gary
NATH, REJISH
Li, Weibin
Dept. of Physics
Keywords: Physics
2020
2020-AUG-WEEK4
TOC-AUG-2020
Issue Date: Aug-2020
Publisher: American Physical Society
Citation: Physical Review A, 102(2).
Abstract: We investigate the dynamics of a three-dimensional Bose-Einstein condensate of ultracold atomic gases with a soft-core-shaped 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.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/4991
https://doi.org/10.1103/PhysRevA.102.023319
ISSN: 2469-9926
2469-9934
Appears in Collections:JOURNAL ARTICLES

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