  Cavity-coupled nanoelectric devices hold great promise for quantum technology
based on coupling between electron-spins and photons. In this study, we
approach the description of these effects through the modeling of a nanodevice
using a quantum master equation. We assume a quantum ring is coupled to two
external leads with different temperatures and embedded in a cavity with a
single photon mode. Thermospin transport of the ring-cavity system is
investigated by tuning the Rashba coupling constant and the electron-photon
coupling strength. In the absence of the cavity, the temperature gradient of
the leads causes a generation of a thermospin transport in the ring system. It
is observed that the induced spin polarization has a maximum value at the
critical value of the Rashba coupling constant corresponding to the
Aharonov-Casher destructive interference, where the thermospin current is
efficiently suppressed. Embedded in a photon cavity with the photon energy
close to a resonance with the energy spacing between lowest states of the
quantum ring, a Rabi splitting in the energy spectrum is observed. Furthermore,
photon replica states are formed leading to a reduction in the thermospin
current.
