时 间: 2011年4月22日（周五）上午10:00

地 点: 清华大学高等研究院 科学馆322报告厅

题 目: Disordered bosons and the superconductor-insulator transition

报 告 人: Professor Thomas Nattermann

Institut für Theoretische Physik

Universität zu Köln

Germany

报告摘要: The description of bosons in disordered potentials requires from the outset the consideration of their interaction. I will show that for low density $n$ a boson condensate decays into fragments. Increasing $n$ the number of fragments increases untill at a critical density $n_c$ the transition to the superfluid proceeds. $n_c$ is determine by the equality of the Larkin and the healing length.

Two applications of our theory will be considered: cold atoms in disordered traps and the insulating phase of a disordered superconductors in an external magnetic field.

(see also Phys. Rev. B 80, 104515 (2009), Phys. Rev. Lett. 105, 267001 (2010))