Quantum Droplets of Dipolar Mixtures

authored by: R. N. Bisset, L. A. Peña Ardila, L. Santos
Abstract: Recently achieved two-component dipolar Bose-Einstein condensates open exciting possibilities for the study of mixtures of ultra-dilute quantum liquids. While non-dipolar self-bound mixtures are necessarily miscible with an approximately fixed ratio between the two densities, the density ratio for the dipolar case is free. As a result, self-bound dipolar mixtures present qualitatively novel and much richer physics, characterized by three possible ground-state phases: miscible, symmetric immiscible and asymmetric immiscible, which may in principle occur at any population imbalance. Self-bound immiscible droplets are possible due to mutual non-local inter-component attraction, which results in the formation of a droplet molecule. Moreover, our analysis of the impurity regime, shows that quantum fluctuations in the majority component crucially modify the miscibility of impurities. Our work opens intriguing perspectives for the exploration of spinor physics in ultra-dilute liquids, which should resemble to some extent that of 4He-3He droplets and impurity-doped helium droplets.
Organisation(s): Institute of Theoretical Physics
QuantumFrontiers
External Organisation(s): University of Innsbruck
Type: Article
Journal: Physical Review Letters
Volume: 126
ISSN: 0031-9007
Publication date: 13.01.2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Physics and Astronomy
Electronic version(s): https://arxiv.org/abs/2007.00404v1 (Access: Open)
https://doi.org/10.1103/PhysRevLett.126.025301 (Access: Closed)

BibTeX

@article{4063eae9423342988f8f50a4fb38dc28,
title = "Quantum Droplets of Dipolar Mixtures",
abstract = " Recently achieved two-component dipolar Bose-Einstein condensates open exciting possibilities for the study of mixtures of ultra-dilute quantum liquids. While non-dipolar self-bound mixtures are necessarily miscible with an approximately fixed ratio between the two densities, the density ratio for the dipolar case is free. As a result, self-bound dipolar mixtures present qualitatively novel and much richer physics, characterized by three possible ground-state phases: miscible, symmetric immiscible and asymmetric immiscible, which may in principle occur at any population imbalance. Self-bound immiscible droplets are possible due to mutual non-local inter-component attraction, which results in the formation of a droplet molecule. Moreover, our analysis of the impurity regime, shows that quantum fluctuations in the majority component crucially modify the miscibility of impurities. Our work opens intriguing perspectives for the exploration of spinor physics in ultra-dilute liquids, which should resemble to some extent that of 4He-3He droplets and impurity-doped helium droplets. ",
keywords = "cond-mat.quant-gas",
author = "Bisset, {R. N.} and Ardila, {L. A. Pe{\~n}a} and L. Santos",
note = "Funding Information: We thank L. Chomaz and F. Ferlaino for stimulating discussions. We acknowledge support of the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy, EXC-2123 QuantumFrontiers, 390837967, and FOR 2247. R. N. B. acknowledges the European Union{\textquoteright}s Horizon 2020 research and innovation program under the Marie Sk{\l}odowska-Curie Grant Agreement No. 793504 (DDQF).",
year = "2021",
month = jan,
day = "13",
doi = "10.1103/PhysRevLett.126.025301",
language = "English",
volume = "126",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "2",
}