Abstract-Terahertz radiation, circular dichroism, and optical activity of a Rashba quantum ring subjected to a static electric field

Omid Sharifi Sedeh and MirFaez Miri

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.235434

We study a Rashba quantum ring subjected to an in-plane static electric field. Due to the violation of the rotational symmetry, the system radiates at the Rabi frequency upon interaction with a strong electromagnetic field. With a proper choice of the driving amplitude, the radiation frequency is in the range of $0.1-10\mathrm{THz}$. Due to the Rashba spin-orbit interaction which splits the spin-up and spin-down states and affects the transitions between the ground and excited states, the system exhibits circular dichroism and optical activity. The static electric field and gate-voltage-dependent Rashba parameter strongly influence the system. In other words, the Rashba quantum ring may serve as an electrically tunable terahertz emitter, absorption modulator, dichroic element, and polarization rotator.

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