Skip to content
Prof. Lode Pollet
LMU Munich, Germany
PhD 2005 Ghent University , PostDoc 2005-2008 ETH Zurich , PostDoc fellow 2008-2010 Univ. Massachusetts/Harvard University, Research Assistant 2010-2011 ETH Zurich, Professor 2011-Now University of Munich.
Visiting dates: 2018-09-03 - 2018-09-07 Office No: M808 E-mail: lode.pollet@physik.uni-muenchen.de
Inviter/Contact Person:
Lei Wang
Talk Title: The scratched-XY model in 2D: it is not Kosterlitz-Thouless
Talk Place: M830
Talk Time: 4-Sep-2018 2:00 pm
I show that the 2D classical XY model with disordered scratches can host a new mechanism to destroy superfluidity. As the disorder grows stronger the mechanism driving the superfluid transition changes from conventional vortex-pair unbinding (Kosterlitz-Thouless physics) to a strong randomness criticality characterized by a non-universal jump of the superfluid stiffness. The strong randomness criticality can be described by an asymptotically exact semi-renormalization group theory, previously developed for the superfluid-insulator transition in one-dimensional disordered quantum systems, whose physics I will review. Numerical simulation unambiguously establish that this theory indeed describes the physics of the classical 2D XY model with disordered scratches.

Appointments
Description Place Time Notes

If you want to talk with Prof. Lode Pollet, please click here to make an appointment.