  We study experimentally and theoretically the temperature dependence of
transverse magnetic routing of light emission from hybrid
plasmonic-semiconductor quantum well structures where the exciton emission from
the quantum well is routed into surface plasmon polaritons propagating along a
nearby semiconductor-metal interface. In II-VI and III-V direct band
semiconductors the magnitude of routing is governed by the circular
polarization of exciton optical transitions, that is induced by a magnetic
field. For structures comprising a (Cd,Mn)Te/(Cd,Mg)Te diluted magnetic
semiconductor quantum well we observe a strong directionality of the emission
up to 15% at low temperature of 20 K and magnetic field of 485 mT due to giant
Zeeman splitting of holes mediated via the strong exchange interaction with
Mn$^{2+}$ ions. For increasing temperatures towards room-temperature the
magnetic susceptibility decreases and the directionality strongly decreases to
4% 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 emission
directionality up to 5% for temperatures below 200 K and moderate magnetic
fields of 1 T.
