1,941 research outputs found
Bistability in Microcavities with Incoherent Optical or Electrical Excitation
We consider a quantum well embedded in a zero-dimensional microcavity with a
sub-wavelength grated mirror, where the x-linearly polarized exciton mode is
strongly coupled to the cavity photon, while y-polarized excitons remain in the
weak coupling regime. Under incoherent optical or electric pumping, we
demonstrate polariton bistability associated with parametric scattering
processes. Such bistability is useful for constructing polaritonic devices with
optical or electrical incoherent pumping.Comment: 5 pages, 3 figure
Incoherent excitation and switching of spin states in exciton-polariton condensates
We investigate, theoretically and numerically, the spin dynamics of a
two-component exciton-polariton condensate created and sustained by
non-resonant spin-polarized optical pumping of a semiconductor microcavity.
Using the open-dissipative mean-field model, we show that the existence of well
defined phase-locked steady states of the condensate may lead to efficient
switching and control of spin (polarization) states with a non-resonant
excitation. Spatially inhomogeneous pulsed excitations can cause symmetry
breaking in the pseudo-spin structure of the condensate and lead to formation
of non-trivial spin textures. Our model is universally applicable to two weakly
coupled polariton condensates, and therefore can also describe the behaviour of
condensate populations and phases in 'double-well' type potentials
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