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TT: Fachverband Tiefe Temperaturen
TT 69: Other Low Temperature Topics: Cold Atomic Gases
TT 69.11: Vortrag
Mittwoch, 18. März 2015, 17:45–18:00, A 053
Artificial gauge fields in extra dimensions — •Julius Ruseckas1, Gediminas Juzeliunas1, Ian Spielman2,3, Alessio Celi4, Pietro Massignan4, Nathan Goldman5, and Maciej Lewenstein4,6 — 1Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12, Vilnius, LT-01108 Lithuania — 2Joint Quantum Institute, University of Maryland, College Park, Maryland 20742-4111, USA — 3National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA — 4ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, E- 08860 Castelldefels (Barcelona), Spain — 5Laboratoire Kastler Brossel, CNRS, UPMC, ENS, 24 rue Lhomond, F- 75005 Paris, France — 6ICREA-Institucio Catalana de Recerca i Estudis Avancats, E-08010 Barcelona, Spain
We demonstrate [1] that one can engineer a two-dimensional lattice with nonzero synthetic magnetic flux using atoms in a standard one-dimensional optical lattice. The additional dimension appears due to laser-assisted transitions between the atomic sub-levels in the ground state manifold. A distinctive feature of the proposed scheme is the sharp boundaries in the extra dimension, a feature that is difficult to implement for the atoms in optical lattices in the real-space. The boundaries of the extra dimension can be closed down using additional laser-assisted transitions. which leads to a remarkably simple realisation of the fractional (Hofstadter butterfly-type) spectrum.
[1] A. Celi, P. Massignan, J. Ruseckas, N. Goldman, I. B. Spielman,
G. Juzeliunas, and M. Lewenstein,
Phys. Rev. Lett. 112, 043001 (2014).