"Phonon-enhanced coherent scattering in a driven quantum dot"
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The recent experimental characterisation of exciton-phonon interactions in a
coherently-driven semiconductor quantum dot (QD) [1, 2], and their
interpretation in terms of a two-level system in contact with a bosonic
environment, have demonstrated that QDs offer a natural platform in which to
explore dissipative dynamics in the solid-state. In particular, the interplay
between laser-driven coherent excitonic oscillations and incoherent
phonon-induced processes leads to a rich dynamical behaviour, which can also
have a profound effect on the dot photon emission characteristics.
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In this talk, I shall explore the crucial role played by the solid-state
environment in determining the photon emission properties of a driven quantum
dot [3]. In fact, I shall show that such environmental interactions can lead to
quantum dot emission characteristics that deviate fundamentally from the
well-established quantum optical behaviour of driven atoms. Specifically, for
resonant driving, the coherently emitted radiation field can actually increase
with driving strength due to the quantum nature of the phonon bath. This
behaviour is in stark contrast to the conventional (quantum optical) expectation
of a monotonically decreasing fraction of coherent emission with stronger
driving, and should be observable in experimentally achievable regimes.
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References
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[1] A. J. Ramsay et al., Phys. Rev. Lett. 104, 017402 (2010) 
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[2] A. J. Ramsay et al., Phys. Rev. Lett. 105, 177402 (2010) 
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[3] D. P. S. McCutcheon and A. Nazir, arXiv:1208.4620

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