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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.19: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Quantum Phase Transition between Semimetal and Superfluid in a Dirac Cone Model — •Benjamin Obert¹, Philipp Strack¹, So Takei² und Walter Metzner¹ — ¹Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart Germany — ²University of Maryland, USA

We analyse a two-dimensional Dirac cone model which undergoes a quantum phase transition between a semimetal and a superfluid. We compute fluctuation effects by using flow equations derived within the functional renormalization group (fRG) framework [1]. Near the quantum critical point (QCP) fluctuations lead to non Fermi liquid behaviour. The superfluid correlation length is infinite not only at the quantum critical point, but everywhere in the semimetallic phase.
P. Strack, S. Takei, W. Metzner, Phys. Rev. B 81, 125103 (2010)