Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Quantum Gases (Fermions) I

Q 35.2: Talk

Wednesday, March 13, 2019, 14:30–14:45, S HS 037 Informatik

Transverse magnetization effect of the spin-imbalanced Hofstadter-Hubbard model — •Bernhard Irsigler, Jun-Hui Zheng, Mohsen Hafez-Torbati, and Walter Hofstetter — Institut für Theoretische Physik, Frankfurt am Main, Germany

We spin-imbalance the fermionic, time-reversal invariant Hofstadter-Hubbard model through a population difference between two spin states. In the strongly interacting regime, where the system can be described by an effective spin model, we find an exotic spin structure by means of classical Monte-Carlo calculations. Remarkably, this spin structure exhibits a finite transverse net magnetization perpendicular to the magnetization induced by the population imbalance. We further investigate effects of quantum fluctuations within the dynamical mean-field approximation and obtain a rich phase diagram including ferromagnetic, anti-ferromagnetic, and ferrimagnetic phases, where the latter emerges from strong interaction induced quantum entanglement.