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Magnetic-field-modulated terahertz absorption spectra of a quantum ring

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3 Author(s)
Xie, Yan ; Institute of Applied Physics and Computational Mathematics, P.O. Box 8009(28), 100088 Beijing, People’s Republic of China ; Chu, Weidong ; Duan, Suqing

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The magnetic-field-modulated terahertz absorption spectra of a real GaAs quantum ring (QR) are studied by calculating the photon-participated tunneling current through the QR. We find that the absorption of photons can lead to a reduction in the tunneling current and this manifests as dips in the current versus magnetic field curves. There exists a saturation value for the depth of the current dip, which is described by a simple formula. A full width at half maximum less than 10 GHz can be reached for current dips induced by terahertz fields for Rabi frequencies smaller than 2.5 GHz. Our study provides a possible way to realize tunable detection of terahertz fields.

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Applied Physics Letters  (Volume:93 ,  Issue: 2 )