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Strongly inhomogeneous nature of the superfluid-insulator transition

Gabriel Lemarié

Jeudi 16 avril 2015

à 11h en salle C. Brot

Superfluidity is a fascinating example where wave-particle duality allows a super-fluid to flow without any viscosity. On the other hand, disorder due to the presence of impurities leads to localization and insulating behavior. Together, the competition of both superfluidity and disorder constitutes a complex system exhibiting emergent phenomena.

In this seminar, I will present two examples of the strongly inhomogeneous nature of the superfluid-insulator transition. First, I will describe our theoretical and experimental study of the statistical properties of the inhomogeneous order-parameter distribution (OPD) at the verge of the superconductor-insulator transition (SIT). Then, I will report on our quantum Monte Carlo simulations of the Bose-glass insulating phase, governed by huge non self-averaging fluctuations.