Abstract
This paper demonstrates the full dynamic control of on-site energies, the inter-site coupling, as well as the dispersion of lattices of polariton condensates using electrically excited acoustic waves. The spatially and time-dependent acoustic modulation is essentially independent of polariton density, thus making the acoustic modulation applicable to large lattices as well as to the single polariton limit.
Highlights
Microcavity (MC) exciton-polaritons are bosonic quasiparticles resulting from the strong coupling between photons and quantum well excitons [1,2,3,4]
The polariton traps were placed within an acoustic resonator defined by a delay line with two interdigitated transducers (IDTs), as illustrated in DYNAMIC ACOUSTO-OPTICAL CONTROL OF CONFINED
We have demonstrated dynamic control of confined polariton states in a structured MC using both optical and acoustic fields
Summary
Microcavity (MC) exciton-polaritons (polaritons) are bosonic quasiparticles resulting from the strong coupling between photons and quantum well excitons [1,2,3,4]. Dynamic potentials and lattices for polaritons can be generated by exploring nonlinear optical effects induced by spatially modulated light beams [30,31] or by the spatially dependent strain fields, produced by a surface acoustic wave (SAW) [29] Such tunable potentials enable control of on-site lattice energies, as well as the interaction between neighboring lattice sites. We demonstrate that static polariton potentials can be combined with dynamic modulation by optical and SAW fields to provide the previously unattainable dynamic control of the energy, as well as the interaction between confined polariton states. We use a SAW with an amplitude comparable to the Rabi energy to create new dynamic polariton states localized in the energy gap of the static lattice These results prove that acoustic modulation preserves the long spatial coherence of polariton condensates. The experimental findings are well accounted for by a theoretical framework, proving a high degree of controllability of this dynamic polariton system
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