aqora

Dilute magnetic droplets of a bosonic erbium quantum fluid.

Lauriane Chomaz, Simon Baier, Daniel Petter +5 more

Bulletin of the American Physical SocietyJun 7, 20170 citations

Self-Bound Liquid Droplets in Optical Speckle Potentials

Abdelâali Boudjemâa, Karima Abbas

Jan 1, 20230 citations

Self-bound dipolar droplet: A localized matter wave in free space

D. Baillie, Ryan Wilson, R. N. Bisset +1 more

A liquid droplet is a self-bound phase of matter that holds itself together in the absence of a container. Without a container a gas will normally expand to fill space. A method is proposed to produce a self-bound dilute quantum gaseous dipolar Bose-Einstein condensate.

arXiv:1606.00824Physical Review AAug 11, 2016198 citations

Selfbound quantum droplets

Tim Langen, Matthias Wenzel, M. Schmitt +4 more

Bulletin of the American Physical SocietyJun 7, 20170 citations

Quantum liquid droplets in a mixture of Bose-Einstein condensates

C. R. Cabrera, L. Tanzi, J. Sanz +4 more

Quantum droplets are small clusters of atoms self-bound by the balance of attractive and repulsive forces. Here, we report on the observation of droplets solely stabilized by contact interactions in a mixture of two Bose-Einstein condensates. We demonstrate that they are several orders of magnitude more dilute than liquid helium by directly measuring their size and density via in situ imaging. We show that the droplets are stablized against collapse by quantum fluctuations and that they require a minimum atom number to be stable. Below that number, quantum pressure drives a liquid-to-gas transition that we map out as a function of interaction strength. These ultradilute isotropic liquids remain weakly interacting and constitute an ideal platform to benchmark quantum many-body theories.Quantum droplets are small clusters of atoms self-bound by the balance of attractive and repulsive forces. Here, we report on the observation of droplets solely stabilized by contact interactions in a mixture of two Bose-Einstein condensates. We demonstrate that they are several orders of magnitude more dilute than liquid helium by directly measuring their size and density via in situ imaging. We show that the droplets are stablized against collapse by quantum fluctuations and that they require a minimum atom number to be stable. Below that number, quantum pressure drives a liquid-to-gas transition that we map out as a function of interaction strength. These ultradilute isotropic liquids remain weakly interacting and constitute an ideal platform to benchmark quantum many-body theories.

arXiv:1708.07806ScienceDec 14, 2017727 citations

Motion of a Gaussian Through a 2D Dilute BEC Droplet

Zhanna Kuhrij

In the last decades, Bose-Einstein Condensates (BECs) have been a research topic of great interest. In 2015, a new type of liquid was found - dilute self-bound BEC droplets that have orders of magnitude lower density than air. These droplets are not predicted by classical van der Waals theory, but are stabilised by quantum fluctuations. In this bachelor thesis, these droplets were numerically studied when colliding with a Gaussian obstacle in two-dimensions. This is interesting because below a certain velocity, dilute BECs can behave like superfluids. This is called Landau's criterion. Several droplet velocities and Gaussian widths were tested with special focus on two cases: one where the droplet starts outside the Gaussian and one where the droplet starts with the Gaussian inside of it. The droplet was then propagated until the Gaussian was approximately at the centre of the droplet. In none of the collisions simulated, laminar- attached vortices- or vortex street flow patterns were observed. These are flow patterns one can see in similar classical examples and/or with trapped dilute BECs. However, it appeared that in all the cases the droplet did not fully behave like a superfluid. It might have been quantum fluctuations that created a drag force. Further, a large deformation of the droplet could be seen when the droplet started outside a broad Gaussian. This is believed to have been caused by the Gaussian piercing the surface of the droplet. Finally, suggestions for future research are given at the end of this thesis.In the last decades, Bose-Einstein Condensates (BECs) have been a research topic of great interest. In 2015, a new type of liquid was found - dilute self-bound BEC droplets that have orders of magnitude lower density than air. These droplets are not predicted by classical van der Waals theory, but are stabilised by quantum fluctuations. In this bachelor thesis, these droplets were numerically studied when colliding with a Gaussian obstacle in two-dimensions. This is interesting because below a certain velocity, dilute BECs can behave like superfluids. This is called Landau's criterion. Several droplet velocities and Gaussian widths were tested with special focus on two cases: one where the droplet starts outside the Gaussian and one where the droplet starts with the Gaussian inside of it. The droplet was then propagated until the Gaussian was approximately at the centre of the droplet. In none of the collisions simulated, laminar- attached vortices- or vortex street flow patterns were observed. These are flow patterns one can see in similar classical examples and/or with trapped dilute BECs. However, it appeared that in all the cases the droplet did not fully behave like a superfluid. It might have been quantum fluctuations that created a drag force. Further, a large deformation of the droplet could be seen when the droplet started outside a broad Gaussian. This is believed to have been caused by the Gaussian piercing the surface of the droplet. Finally, suggestions for future research are given at the end of this thesis.

Jan 1, 20200 citations

Self-bound droplets of a dilute magnetic quantum liquid

Related papers

Self-bound droplets of a dilute magnetic quantum liquid

Related papers