Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 3: Quantum Gases: Bosons I
Q 3.3: Vortrag
Montag, 8. März 2010, 14:30–14:45, E 001
Quasi-relativistic physics with ultra-cold gases — Julius Ruseckas1, Gediminas Juzeliunas1, Michael Merkl2, Frank Zimmer2, Patrik Öhberg2, Markus Lindberg3, Andreas Jacob4, and •Luis Santos4 — 1Institute of Theoretical Physics and Astronomy of Vilnius University, A. Gostauto 12, Vilnius 01108, Lithuania — 2School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom — 3Department of Physics, Abo Akademi University, Abo FIN-20500, Finland — 4Institute of Theoretical Physics, Leibniz University of Hannover, Appelstr. 2 D-30169, Hannover, Germany
Although cold gases are typically neutral, artificial electromagnetism may be induced by rotation, hopping-engineering in lattices and particular laser arrangements (as recently realized at NIST). We focus on the latter, discussing how spin-orbit coupling (SOC) may be induced in cold atoms, leading to a Dirac point and quasi-relativistic physics, in spite of the extremely low velocities. After discussing some quasi-relativistic consequences (as atomic Veselago super-lensing), we comment on the nonlinear properties of spinor condensates with SOC, which under proper conditions are described by a nonlinear Dirac equation, which present self-localized solutions, resembling chiral confinement in high-energy physics. We analyze 1D self-confined condensates, which present an intriguing sinusoidal dependence with the interaction strength. In addition, we show that the interplay between SOC and non-linearity may allow for self-localized condensates in 2D and 3D, which are fundamentally unstable in standard condensates.