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We study experimentally and theoretically the temperature dependence oftransverse magnetic routing of light emission from hybridplasmonic-semiconductor quantum well structures where the exciton emission fromthe quantum well is routed into surface plasmon polaritons propagating along anearby semiconductor-metal interface. In II-VI and III-V direct bandsemiconductors the magnitude of routing is governed by the circularpolarization of exciton optical transitions, that is induced by a magneticfield. For structures comprising a (Cd,Mn)Te/(Cd,Mg)Te diluted magneticsemiconductor quantum well we observe a strong directionality of the emissionup to 15% at low temperature of 20 K and magnetic field of 485 mT due to giantZeeman splitting of holes mediated via the strong exchange interaction withMn$^{2+}$ ions. For increasing temperatures towards room-temperature themagnetic susceptibility decreases and the directionality strongly decreases to4% at T = 45 K. We also propose an alternative design based on a non-magnetic(In,Ga)As/(In,Al)As quantum well structure, suitable for higher temperatures.According to our calculations, such structure can demonstrate emissiondirectionality up to 5% for temperatures below 200 K and moderate magneticfields of 1 T.

Transverse magnetic routing of light emission in hybrid plasmonic-semiconductor nanostructures: Towards operation at room temperature