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HL: Fachverband Halbleiterphysik

HL 16: Focussed Session: Quantum Nanophotonics in Solid State Systems: Status, Challenges and Perspectives I (joint session HL/TT)

HL 16.9: Vortrag

Dienstag, 13. März 2018, 12:30–12:45, EW 201

Confined microcavity polaritons: effect of trap geometry on potential shape — •Alexander Kuznetsov, Paul Helgers, Klaus Biermann, and Paulo Santos — Hausvogteiplatz 5-7, 10117 Berlin, Germany

Micorcavity (MC) exciton-polaritons (MPs) result from the strong light-matter coupling. MPs may be quantum-confined using micrometer-sized static potentials (traps). Arrays of such traps have been suggested for quantum-simulators. The latter require energy- and spatial overlap of wave functions of trapped single polaritons and thus precise control of the trap shape and size. In this work, we investigate the two-dimensional and three-dimensional confinement of MPs in traps produced by shallow etching and overgrowth of (Al,Ga)As MC. Using low-temperature photoluminescence, atomic-force microscopy and numerical modeling we correlate trap shape and size with the energy spectrum and spatial profile of MPs wave functions. We find that the um-sized potential is of neither purely square nor parabolic type. We show that the trap potential is anisotropic due to the different overgrowth kinetics along [-110] and [-1-10] directions. We present a model to explain non-degenerate energy levels in the emission spectra of confined MPs, which also predicts the minimum size and confinement strength of MPs traps.