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Self-bound droplets of a dipolar Bose-Einstein condensate

Event Details

Event Dates: 

Thursday, October 5, 2017 - 3:30pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Blair Blakie

Speaker Affiliation(s): 

University of Otago
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Public Seminar

Event Details & Abstract: 

Reception in Hbar at 3:00 pm. 

Recent experiments with Bose-Einstein condensates of dysprosium [1] and erbium [2] atoms have observed the formation of dilute quantum gas droplets that can preserve their form, even in the absence of any external confinement [3]. These droplets occur when the long-ranged dipole-dipole interaction between the atoms dominates over the short-ranged contact interaction. In this regime meanfield theory predicts that the condensate is unstable to collapse, however the Lee-Huang-Yang quantum fluctuation corrections to the meanfield energy [4] can stabilize the system as one or many finite sized droplets. I will discuss our current understanding of these droplets, and introduce a new type of nonlinear Schrodinger equation used to describe their equilibrium and dynamical properties. 

 
References:
[1] H. Kadau, M. Schmitt, M. Wenzel, C. Wink, T. Maier, I. Ferrier-Barbut, and T. Pfau, “Observing the Rosensweig instability of a quantum ferrofluid,” Nature 530, 194–197 (2016).

[2] L. Chomaz, S. Baier, D. Petter, M. J. Mark, F. Wachtler, L. Santos,and F. Ferlaino, “Quantum-fluctuation-driven crossover from a dilute Bose-Einstein condensate to a macrodroplet in a dipolar quantum fluid,” Phys. Rev. X 6, 041,039 (2016).

[3] M. Schmitt, M. Wenzel, F. Bottcher, I. Ferrier-Barbut, and T. Pfau, “Self-bound droplets of a dilute magnetic quantum liquid,” Nature 539, 259–262 (2016).

[4] T. D. Lee, K. Huang, and C. N. Yang, “Eigenvalues and eigenfunctions of a Bose system of hard spheres and its low-temperature properties,” Phys. Rev. 106, 1135–1145 (1957).

[5] D. Baillie, R. M. Wilson, R. N. Bisset, and P. B. Blakie, “Self-bound dipolar droplet:A localized matter wave in free space,” Phys. Rev. A 94, 021,602(R) (2016).