Light-mass Bragg cavity polaritons in planar quantum dot lattices

Details Light-mass Bragg cavity polaritons in planar quantum dot lattices Light-mass Bragg cavity polaritons in planar quantum dot lattices

2007-10-17

arxiv.org/abs/0710.3306v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages and 7 figures

Scientific paper

10.1103/PhysRevB.77.085306

The exciton-polariton modes of a quantum dot lattice embedded in a planar optical cavity are theoretically investigated. Umklapp terms, in which an exciton interacts with many cavity modes differing by reciprocal lattice vectors, appear in the Hamiltonian due to the periodicity of the dot lattice. We focus on Bragg polariton modes obtained by tuning the exciton and the cavity modes into resonance at high symmetry points of the Brillouin Zone. Depending on the microcavity design these polaritons modes at finite in-plane momentum can be guided and can have long lifetimes. Moreover, their effective mass can be extremely small, of the order of $10^{-8} m_0$ ($m_0$ is the bare electron mass), and they constitute the lightest exciton-like quasi-particles in solids.

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