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arXiv · 1403.2988

Operation speed of polariton condensate switches gated by excitons

C. Antón·T. C . H. Liew·D. Sarkar·M. D. Martín·Z. Hatzopoulos·P. S. Eldridge·P. G. Savvidis·L. Viña
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Abstract

We present a time-resolved photoluminescence (PL) study in real- and momentum-space of a polariton condensate switch in a quasi-1D 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 $\thicksim50$ ps, respectively. The opposite transition is governed by the long-lived gate excitons, consequently the OFF/ON-switching time is $\thicksim200$ ps, limiting the overall operation speed of the device to $\thicksim3$ 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.

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C. Antón, T. C . H. Liew, D. Sarkar, M. D. Martín, Z. Hatzopoulos, P. S. Eldridge, P. G. Savvidis, L. Viña. 2014-06-18. Operation speed of polariton condensate switches gated by excitons. https://doi.org/10.1103/physrevb.89.235312

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