Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 33: Poster II

DY 33.48: Poster

Donnerstag, 14. März 2013, 17:00–19:00, Poster C

Incommensurate Nematic Fluctuations in 2d Metals — •Tobias Holder and Walter Metzner — Max-Planck-Institute for Solid State Research, D-70569 Stuttgart

In a homogeneous nematic state an orientational symmetry of the system is spontaneously broken, without breaking the translation invariance. However, in 2010 Metlitski and Sachdev (New J. Phys. 12, 105007) found a tendency toward formation of a modulated nematic state in a two-dimensional metal with strong antiferromagnetic spin-density wave fluctuations.

We investigate the possibility of a modulated nematic state from a model of tight-binding electrons on a square lattice with an interaction that has an attractive d-wave component for forward scattering in the charge channel. Within a random phase approximation (RPA), we find that the wave vector of the nematic quantum fluctuations is generically nonzero at T=0. At finite temperatures the nematic fluctuations are reduced considerably due to their singular momentum dependence, restricting sizable effects of incommensurate fluctuations to very low temperatures.

Ref.: T. Holder and W. Metzner, Phys. Rev. B 85, 165130 (2012).