O PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA convida para o seminário:
Pattern-formation and Critical Behaviour in Dipolar Bose-Einstein Condensates*
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark
*Evento de reposição para os alunos matriculados na disciplina seminários
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.
 A. M. Turing, Philos. Trans. Royal Soc. B 23 237 (1952).
 H. Kadau, M. Schmitt, M. Wenzel, C. Wink, T. Maier, I. Ferrier-Barbut, T. Pfau, Nature 530 194 (2016).
 Y. Zhang, F.M., T. Pohl, arXiv:1903.06161v1 (2019).
Data: 09 de abril de 2019 – (terça-feira) Local: Sala 212 – Auditório do Departamento de Física – Horário: 16 horas