EL PROGRAMA DE POSGRADO EN FÍSICA invita a todos para lo seminario:
Pattern-formation and Critical Behaviour in Dipolar Bose-Einstein Condensates
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
The formation of patterns with long-range order continues to fascinate scientists from a broad range of natural sciences . In this talk I will discuss pattern-formation in dipolar Bose-Einstein condensates. In this system the possibility of obtaining quantum states with self-organized long-ranged ordering can be facilitated by quantum fluctuations which suppress collapse and pave the way for supersolids in this system . Here, supersolidity refers to a state of matter which displays long-range ordering whilst maintaining a large superfluid fraction. I will present recent results which focus on the critical behaviour of the superfluid-supersolid phase-transition  and the crucial role quantum fluctuations can play for the latter. We find that quantum fluctuations can alter the order of the phase transition from first- to second order. Furthermore, apart from the usual triangular lattice of density droplets, quantum fluctuations can give rise to a novel quantum state whose density distribution displays a honeycomb structure.
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 Y. Zhang, F.M., T. Pohl, arXiv:1903.06161v1 (2019).
Fecha: 9 de abril de 2019 – (martes) Lugar: Sala 212 – Auditorio del Departamento de Física – Horário: 4:00 p.m.