Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Ultracold Atoms II

Q 57.7: Talk

Friday, March 10, 2017, 16:00–16:15, P 104

Semiclassical theory of synchronization-induced cooling — •Simon B. Jäger¹, Stefan Schütz^1,2, Minghui Xu^3,4, Jinx Cooper^3,4, Murray J. Holland^3,4, and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — ²icFRC, IPCMS (UMR 7504), ISIS (UMR 7006), Université de Strasbourg and CNRS, 67000 Strasbourg, France — ³JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA — ⁴Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA

We analyse the cooling dynamics of the motion of atoms confined inside an optical cavity, in the regime in which the atoms are incoherently pumped and the dipoles can synchronize. Our study is performed in the semiclassical regime and assuming that cavity decay is the largest rate characterizing the dynamics. We show that the cooling dynamics consists of three regimes. First hot atoms are individually cooled by the cavity friction forces. After this stage, motion and internal degrees of freedom evolve and the motion is further cooled until the dipoles synchronize. In this latest stage, when the dipoles are sychronized dipole-dipole correlations are stationary and the motion is further cooled to temperatures which are limited by the pump rate. In this regime spin and atomic position are correlated, such that the internal excitations oscillate spatially with the cavity standing wave forming an effective antiferromagnetic order. We discuss the limits of the semiclassical treatment and its extension to a full quantum mechanical model.