Finite-temperature scaling close to Ising-nematic quantum critical points in two-dimensional metals

Punk, Matthias (2016): Finite-temperature scaling close to Ising-nematic quantum critical points in two-dimensional metals. In: Physical Review B, Bd. 94, Nr. 19, 195113

Abstract

We study finite-temperature properties of metals close to an Ising-nematic quantum critical point in two spatial dimensions. In particular we show that at any finite temperature there is a regime where order parameter fluctuations are characterized by a dynamical critical exponent z = 2, in contrast to z = 3 found at zero temperature. Our results are based on a simple Eliashberg-type approach, which gives rise to a boson self-energy proportional to Omega/gamma(T) at small momenta, where gamma(T) is the temperature dependent fermion scattering rate. These findings might shed some light on recent Monte Carlo simulations at finite temperature, where results consistent with z = 2 were found.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2469-9950
• Sprache: Englisch