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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster Quanteneffekte

Q 29.12: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C2

Stationary light and Klein tunneling — •Razmik Unanyan and Michael Fleischhauer — Fachbereich Physik, TU Kaiserslautern

We discuss the generation and coherent manipulation of stationary pulses of light in atomic ensemble with electromagnetically induced transparency with two counterpropagating control fields. In particular we discuss the limits on the spatial confinement of these pulses when the latter becomes comparable to the absorption length of the medium. In this case the stationary field in the dilute gas can be described by a two-component spinor which obeys the two-dimensonal Dirac-Weyl equation in an external potential generated by a spatially varying two-photon detuning. We show that a fundamental lower limit to the spatial confinement arises from Klein tunneling. We determine the linewidth of the resonances in the effective potential and discuss conditions for optimizing spatial confinement and tunneling losses.