Facebook Twitter Instagram YouTube

Nonperturbative RG treatment of amplitude fluctuations for φ^4 topological phase transitions

Event Details

Event Dates: 

Thursday, October 12, 2017 - 12:00pm

Seminar Location: 

  • Duane Physics Room G126

Speaker Name(s): 

N. Defenu

Speaker Affiliation(s): 

University of Heidelberg
Seminar Type/Subject

Scientific Seminar Type: 

  • Biophysics Seminar

Event Details & Abstract: 

The study of the Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional φ^4 models can be performed in several representations, and the amplitude-phase (AP) Madelung parametrization is the natural way to study the contribution of density fluctuations to non-universal quantities. We show how one can obtain a consistent phase diagram in the AP representation using the functional renormalization group scheme. Constructing the mapping between φ^4 and the XY models allows us to treat these models on equal footing. We estimate universal and non-universal quantities of the two models and find good agreement with available Monte Carlo results. The presented approach is flexible enough to treat parameter ranges of experimental relevance.

JILA follows the six University nodes' policies for ensuring harassment-free environments. For more detailed information regarding the University of Colorado policies, please read the Discrimination and Harassment Policy and Procedures.