Condensed Matter Seminar Series

Non-Analytic Behavior of Fermi- and Non-Fermi Liquids

Dmitrii Maslov

University of Florida

Thursday March 5,  11:00 am,  Room 298,  Physics Building

Abstract:  The Fermi-liquid theory states that the low-energy properties of an interacting Fermi system are similar to that of the Fermi gas. However, in contrast to the Fermi gas, where all thermodynamic quantities are analytic functions of the appropriate energy scales (temperature, Zeeman energy, etc.), the finite-energy corrections to the Fermi-liquid behavior are non-analytic. This non-analytic behavior is due to collinear scattering events, which become increasingly more probable as the dimensionality is reduced. In this talk, I will focus on the non-analytic behavior of the spin susceptibility and discuss its relation to the breakdown of a continuous ferromagnetic quantum phase transition, recent observations of a strong temperature dependence of the susceptibility in the normal phase of Fe-based pnictides, and potential applications in quantum computing.