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Seminars»22.01.2019 - Ahmet Keles : Quantum many-body phenomena in ultracold dipolar gases

22.01.2019 - Ahmet Keles : Quantum many-body phenomena in ultracold dipolar gases

Quantum many-body phenomena in ultracold dipolar gases

Ahmet Keles
University of Pittsburgh and George Mason University, USA
22 January 2019, Tuesday, 14:40
Cavid Erginsoy Seminar Room, Physics Department, 3rd floor

Abstract: Recent experiments on ultracold atomic gases of magnetic atoms and dipolar molecules begin to simulate quantum phases dominated by the long-range, anisotropic dipole-dipole interaction. This talk is about how to study different aspects of quantum many-body phenomena based on such cold dipolar gases. I will start with discussing the possibility of several exotic phases in such systems, including the p-wave superfluid, the stripe density wave, and a supersolid. Then, in the opposite limit of strongly localized dipoles in a deep optical lattice, I will show that a dipolar Heisenberg model can be realized that can give rise a robust quantum paramagnetic phases such as quantum spin liquids in a surprisingly wide region. I will briefly explain our theoretical approach based on functional renormalization group (RG) theory, which treats all many-body instabilities on equal footing. Our finding points to a promising direction to search for quantum spin liquids in ultracold dipolar molecules. Finally, I will show how a quantum spin model of randomly oriented dipoles can be utilized to realize many-body quantum chaotic systems such as Sachdev-Ye-Kitaev (SYK) model by demonstrating fast scrambling of quantum information as in Black Holes, probed via out-of-time order correlation (OTOC) functions.