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Q: Fachverband Quantenoptik und Photonik

Q 66: Quantum Effects: QED III

Q 66.5: Vortrag

Freitag, 4. März 2016, 12:15–12:30, f442

Localization transition in presence of cavity backaction — •Katharina Rojan¹, Rebecca Kraus¹, Thomás Fogarty¹, Hessam Habibian^2,3, Anna Minguzzi⁴, and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — ²Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain — ³Institut de Ciéncies Fotóniques (ICFO), Mediterranean Technology Park, E-08860 Castelldefels (Barcelona), Spain — ⁴Laboratoire de Physique et Modélisation des Milieux Condensés, C.N.R.S, B.P. 166, 38042 Grenoble, France

We study the localization transition of an atom in a bichromatic lattice, when the depth of the second, incommensurate lattice depends on the spatial wave function of the atoms. This situation can be realised when the second potential is the standing wave of a high-finesse cavity, which strongly couples with the atom in the dispersive regime and whose wavelength is incommensurate with the wavelength of the confining optical lattice. By means of a mapping to a Hubbard type Hamiltonian, we identify the extended and the localised phases of the atom as a function of the strength of the cavity nonlinearity and of the depth of the second lattice, and show that the cavity nonlinearity preserves the main properties of the localization transition. We discuss possible experimental realizations in recent cavity electrodynamics experiments.