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Updated: Jun 14, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Turning a first order quantum phase transition continuous by fluctuations: general flow equations and application to
P Jakubczyk1, W Metzner, H Yamase
1Max-Planck-Institute for Solid State Research, D-70569 Stuttgart, Germany. p.jakubczyk@fkf.mpg.de
Abstract:
We derive renormalization group equations which allow us to treat order parameter fluctuations near quantum phase transitions in cases where an expansion in powers of the order parameter is not possible. As a prototypical application, we analyze the nematic transition driven by a d-wave Pomeranchuk instability in a two-dimensional electron system. We find that order parameter fluctuations suppress the first order character of the nematic transition obtained at low temperatures in mean-field theory, so that a continuous transition leading to quantum criticality can emerge.
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