Operation speed of polariton condensate switches gated by excitons
EntityUAM. Departamento de Física de Materiales
PublisherAmerican Physical Society
10.1103/PhysRevB.89.235312Physical Review B 89.23 (2014): 235312
ISSN1098-0121 (print); 1550-235X (online)
Funded byC.A. acknowledges financial support from Spanish FPU scholarships. P.S. acknowledges GreekGSRT program “ARISTEIA (1978) and EU ERC “Polaflow” for financial support. The work was partially supported by the Spanish MEC MAT2011-22997, CAM (S-2009/ESP-1503), and INDEX (289968) projects
ProjectComunidad de Madrid. S2009/ESP-1503/Q&CLIGHT
Rights© 2014 American Physical Society
We present a time-resolved photoluminescence (PL) study in real and momentum space of a polariton condensate switch in a quasi-one-dimensional semiconductor microcavity. The polariton flow across the ridge is gated by excitons inducing a barrier potential due to repulsive interactions. A study of the device operation dependence on the power of the pulsed gate beam obtains a satisfactory compromise for the on-off signal ratio and switching time of the order of 0.3 and ∼50 ps, respectively. The opposite transition is governed by the long-lived gate excitons, consequently, the off-on switching time is ∼200 ps, limiting the overall operation speed of the device to ∼3 GHz. The experimental results are compared to numerical simulations based on a generalized Gross-Pitaevskii equation, taking into account incoherent pumping, decay, and energy relaxation within the condensate
Google Scholar:Antón, C. - Liew, T. C H - Sarkar, D. - Martín, M. D. - Hatzopoulos, Z. - Eldridge, P. S. - Savvidis, P. G. - Viña Liste, Luis M.
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