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HL: Fachverband Halbleiterphysik

HL 37: III-V Semiconductors

HL 37.6: Vortrag

Dienstag, 21. März 2017, 11:15–11:30, POT 112

Optical confinement and conversion of exciton polaritons in a structured (Al,Ga)As microcavity — •Alexander S. Kuznetsov, Paul Helgers, Klaus Biermann, and Paulo V. Santos — Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany

Optical microcavity (MC) exciton polaritons (EPs) are strongly coupled light-matter entities useful for studying quantum phenomena. Due to the macroscopic de Broglie wavelength and small effective mass of EPs, effects of confinement and quantum phases manifest themselves in micrometer sized potentials and Kelvin-temperature range. In particular, confinement of EPs by dynamic acoustic potentials [1] and optical beams [2] benefits realization and manipulation of Bose-Einstein-like quantum phases of EPs. Here we show that much stronger EPs confinement occurs in laterally structured (Al,Ga)As MC fabricated by etching-MBE-overgrowth technique. Lateral confinement is due to the cavity geometry and thus purely optical. This allows for investigation of localization and motion of unperturbed EP gas. Spatially resolved photoluminescence studies reveal quantization of EPs dispersion and wave functions amplitudes due to the confinement, typical of such structures [3]. Closer optical examination reveals conversion of EP to bare excitons and vice-versa across the strong coupling boundaries, a new possibility for manipulation of quantum information.

[1] E. A. Cerda-Méndez et al., PRL 111, 146401 (2013)

[2] J. Schmutzler et al., Phys. Rev. B 91, 195308 (2015)

[3] R. I. Kaitouni et al., Phys. Rev. B 74, 155311 (2006)