Charla Soliton to droplet crossover in attractive Bose-Bose mixtures

Posted on 24th November 2016 in News, Reunion
El próximo viernes viene al Instituto de Física César Cabrera, un estudiante mexicano que está en ICFO haciendo doctorado en el grupo de Leticia Tarruel. Nos dará una charla sobre mezclas Bose-Bose con potasio. El título y resumen de la charla se los presento abajo. El seminario tomará lugar en la sala Sandoval Vallarta el viernes 2 de diciembre a las 11 am.
Soliton to droplet crossover in attractive Bose-Bose mixtures
C. Cabrera, J. Sanz,  L. Tanzi, P. Cheiney, L. Tarruell
ICFO – Institut de Ciencies Fotoniques, The Barcelona Institute of
Science and Technology, 08860 Castelldefels (Barcelona), Spain

In the presence of attractive interactions, a Bose-Bose mixture has been predicted to host a novel type of ultra-dilute liquid-like phase, a quantum droplet [1]. This is a macroscopic self-bound object where the attractive interactions between the particles are exactly compensated by repulsive forces originating purely from quantum fluctuations. Thus, droplets cannot be described in a simple mean-field picture, and their existence is a striking quantum many-body effect. Similar physics has recently been observed in the context of dipolar quantum gases [2-5].

In my talk, I will present the first experimental study of quantum droplets in an attractive spin mixture of two 39K Bose-Einstein condensates. The experiments are performed in an optical wave-guide, where a first order phase transition between a two-component bright soliton and a quantum droplet is expected to take place. We explore the soliton-to-droplet crossover above the critical point and demonstrate the self-bound character of the system, its composite nature, and how quantum fluctuations stabilize the system far beyond the mean-field collapse threshold.

[1] D. S. Petrov, Phys. Rev. Lett. 115, 155302 (2015)

[2] H.Kadau, M.Schmitt, M. Wenzel, C. Wink, T. Maier, I. Ferrier-Barbut and T. Pfau , Nature  530 ,194 (2016)
[3] I. Ferrier-Barbut, H. Kadau, M. Schmitt, M. Wenzel, and T. Pfau, Phys. Rev. Lett. 116, 215301 (2016)
[4] L.Chomaz, S. Baier, D. Petter, M.J. Mark, F. Wächtler, L. Santos and F. Ferlaino, arXiv: 1607.06613
[5] M. Schmitt, M. Wenzel, F. Böttcher, I. Ferrier-Barbut and T. Pfau, Nature 539, 259 (2016)
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