Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 1: Quantum Effects: Light Scattering and Propagation I / Interference and Correlations I

Q 1.2: Vortrag

Montag, 8. März 2010, 14:15–14:30, A 310

Spinor Slow-Light with variable effective mass and anomalous localization — •Johannes Otterbach¹, Razmik Unanyan¹, Michael Fleischhauer¹, Julius Ruseckas², Viaceslav Kudriasov², and Gediminas Juzeliunas² — ¹Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — ²Institute of Theoretical Physics and Astronomy, Vilnius University, 01108 Vilnius, Lithuania

Recently, systems showing an effective Dirac-like time evolution, such as graphene, have acquired a lot of interest. We here show how to create light-matter quasi-particles, so-called dark-state polaritons (DSP), obeying an effective Dirac equation in 1D. These spinor-like objects posses an effective "speed of light", given by the group velocity of slow-light, which can be externally controlled and be made many orders of magnitude smaller than the vacuum speed of light. Furthermore the mass of these spinor slow-light polaritons (SSP) is adjustable in size and sign on a small length scales. It has been shown that a 1D model of random mass Dirac particles shows unusual correlations. For a random mass with vanishing mean value there exists a zero energy (mid-gap) state which decays according to a power-law. We use the freedom of our SSPs to create a spatially randomly varying mass and thus observe the creation of such unusual mid-gap states and discuss a possible experimental implementation and its limitations.