Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.8: Poster

Dienstag, 7. März 2017, 17:00–19:00, P OG1

Commensurate-incommensurate transition in optical cavities — •Andreas Alexander Buchheit¹, Haggai Landa², Cecilia Cormick³, Thomas Fogarty⁴, Vladimir Stojanovic⁵, Eugene Demler⁵, and Giovanna Morigi¹ — ¹Universität des Saarlandes, D-66123 Saarbrücken, Germany — ²LPTMS, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France — ³IFEG, CONICET and Universidad Nacional de Cordoba — ⁴Okinawa Institute of Science and Technology, Japan, — ⁵Department of Physics, Harvard University, Cambridge, MA 02138, USA

In this work we report on the optomechanical dynamics of chains of trapped ions, which couple to the high-Q mode of an optical standing-wave cavity. Their dynamics results from the interplay between the trapping potential, long-range Coulomb repulsion and the cavity-induced interactions. The latter are due to multiple scatterings of laser photons inside the cavity and become relevant when the laser pump is sufficiently strong to overcome photon decay. We study the stationary states of the ions as a function of the cavity and laser parameters, when the typical length scales of the two self-organizing processes, Coulomb crystallization and photon-mediated interactions, are almost commensurate. We analyze the phase diagram as a function of the ratio between the two wavelengths and recover the commensurate-incommensurate transition when cavity backaction can be neglected. We discuss the features of the emerging phases and analyse how they can be detected in the radiation emitted by the cavity.