Fyzikální ústav Akademie věd ČR

Seminář Pátek, 30.09.2016 10:00 - 11:00

Přednášející: Ipsita Mandal (Condensed Matter Theory Department, Faculty of Science, University of Basel, Switzerland and Indian Institute of Technology, Kharagpur, India)
Místo: Na Slovance, přednáškový sál v přízemí
Jazyk: anglicky
Pořadatelé: Oddělení teorie kondenzovaných látek

Abstract: We devise a renormalization group analysis for quantum field theories with Fermi surface to study scaling behavior of non-Fermi liquid states in a controlled approximation. The non-Fermi liquid fixed points are identified from a Fermi surface in (m+1) spatial dimensions, while the co-dimension of Fermi surface is also extended to a generic value. We also study superconducting instability in such systems as a function of dimension and co-dimension of the Fermi surface. The key point in this whole analysis is that unlike in relativistic QFT, the Fermi momentum k_F enters as a dimensionful parameter, thus modifying the naive scaling arguments. The effective coupling constants are found to be combinations of the original coupling constants and k_F.