Spatial Coherence Properties of One Dimensional Exciton-Polariton Condensates

Fischer, Julian; Savenko, I. G.; Fraser, Michael D.; Holzinger, Steffen; Brodbeck, Sebastian; Kamp, M.; Shelykh, I. A.; Schneider, Christian; Hoefling, Sven

doi:10.1103/physrevlett.113.203902

Cited by 44 publications

(34 citation statements)

References 42 publications

(51 reference statements)

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“…Corresponding to cold atom BECs, first-order spatial coherence (long range order) has been discussed as a key criterion for the claim of a polariton BEC [6][7][8][9]; however, the second-order coherence function, representing another key signature of coherent light, is less well understood.…”

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Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates

et al. 2018

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We study the influence of spatial confinement on the second-order temporal coherence of the emission from a semiconductor microcavity in the strong coupling regime. The confinement, provided by etched micropillars, has a favorable impact on the temporal coherence of solid state quasicondensates that evolve in our device above threshold. By fitting the experimental data with a microscopic quantum theory based on a quantum jump approach, we scrutinize the influence of pump power and confinement and find that phonon-mediated transitions are enhanced in the case of a confined structure, in which the modes split into a discrete set. By increasing the pump power beyond the condensation threshold, temporal coherence significantly improves in devices with increased spatial confinement, as revealed in the transition from thermal to coherent statistics of the emitted light.

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Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates

et al. 2018

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“…Nonlocal x =´ x values of the density matrix decay exponentially when x −´ x is longer than the scattering length if we are outside the polariton condensation regime 46 . We confine our attention to the local quantities I(t, x), S x (t, x), S y (t, x), S z (t, x), which are the proper starting point for studying diffusive transport.…”

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Spin response to localized pumps: Exciton polaritons versus electrons and holes

2016

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Polariton polarization can be described in terms of a pseudospin which can be oriented along the x, y, or z axis, similarly to electron and hole spin. Unlike electrons and holes where timereversal symmetry requires that the spin-orbit interaction be odd in the momentum, the analogue of the spin-orbit interaction for polaritons, the so-called TE-TM splitting, is even in the momentum. We calculate and compare spin transport of polariton, electron, and hole systems, in the diffusive regime of many scatterings. After dimensional rescaling diffusive systems with spatially uniform particle densities have identical dynamics, regardless of the particle type. Differences between the three particles appear in spatially non-uniform systems, with pumps at a specific localized point. We consider both oscillating pumps and transient (delta-function) pumps. In such systems each particle type produces distinctive spin patterns. The particles can be distinguished by their differing spatial multipole character, their response and resonances in a perpendicular magnetic field, and their relative magnitude which is largest for electrons and weakest for holes. These patterns are manifested both in response to unpolarized pumps which produce in-plane and perpendicular spin signals, and to polarized pumps where the spin precesses from in-plane to out-of-plane and vice versa. These results will be useful for designing systems with large spin polarization signals, for identifying the dominant spin-orbit interaction and measuring subdominant terms in experimental devices, and for measuring the scattering time and the spin-orbit coupling's magnitude.

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“…Short lifetime of EPs makes the system highly nonequilibrium [16], although spatial coherence has been recently reported [17][18][19]. The theoretical description of such condensates thus requires a kinetic approach, where crucial role is played by the pumping source which should continuously feed the system in order to compensate the losses.…”

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Operation of a semiconductor microcavity under electric excitation

Karpov

Savenko

2016

Applied Physics Letters

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We present a microscopic theory for the description of the bias-controlled operation of an excitonpolariton-based heterostructure, in particular, the polariton laser. Combining together the Poisson equations for the scalar electric potential and Fermi quasi-energies of electrons and holes in a semiconductor heterostructure, the Boltzmann equation for the incoherent excitonic reservoir and the Gross-Pitaevskii equation for the exciton-polariton mean field, we simulate the dynamics of the system minimising the number of free parameters and build a theoretical threshold characteristics: number of particles vs applied bias. This approach, which also accounts for the nonlinear (exciton-exciton) interaction, particle lifetime, and which can, in principle, account for any relaxation mechanisms for the carriers of charge inside the heterostructure or polariton loss, allows to completely describe modern experiments on polariton transport and model devices.

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Spatial Coherence Properties of One Dimensional Exciton-Polariton Condensates

Cited by 44 publications

References 42 publications

Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates

Evolution of Temporal Coherence in Confined Exciton-Polariton Condensates

Spin response to localized pumps: Exciton polaritons versus electrons and holes

Operation of a semiconductor microcavity under electric excitation

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