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Updated: Jun 28, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Spin freezing transition and non-Fermi-liquid self-energy in a three-orbital model
Philipp Werner1, Emanuel Gull, Matthias Troyer
1Columbia University, 538 West 120th Street, New York, NY 10027, USA.
Abstract:
A single-site dynamical mean-field study of a three band model with the rotationally invariant interactions appropriate to the t_(2g) levels of a transition metal oxide reveals a quantum phase transition between a paramagnetic metallic phase and an incoherent metallic phase with frozen moments. The Mott transitions occurring at electron densities n=2, 3 per site take place inside the frozen moment phase. The critical line separating the two phases is characterized by a self-energy with the frequency dependence Sigma(omega) approximately sqrt[omega] and a broad quantum critical regime. The findings are discussed in the context of the power law observed in the optical conductivity of SrRuO3.
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