Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System
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Physics Department, College of Science, University of Sulaimani, Sulaimani 46001, Kurdistan Region, Iraq
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Komar Research Center, Komar University of Science and Technology, Sulaimani 46001, Kurdistan Region, Iraq
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Department of Mechanical Engineering, National United University, 2, Lienda, Miaoli 36063, Taiwan
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School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland
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Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 1023; https://doi.org/10.3390/nano9071023
Received: 11 June 2019 / Revised: 8 July 2019 / Accepted: 10 July 2019 / Published: 17 July 2019
We study the transport properties of a wire-dot system coupled to a cavity and a photon reservoir. The system is considered to be microstructured from a two-dimensional electron gas in a GaAs heterostructure. The 3D photon cavity is active in the far-infrared or the terahertz regime. Tuning the photon energy, Rabi-resonant states emerge and in turn resonant current peaks are observed. We demonstrate the effects of the cavity–photon reservoir coupling, the mean photon number in the reservoir, the electron–photon coupling and the photon polarization on the intraband transitions occurring between the Rabi-resonant states, and on the corresponding resonant current peaks. The Rabi-splitting can be controlled by the photon polarization and the electron–photon coupling strength. In the selected range of the parameters, the electron–photon coupling and the cavity-environment coupling strengths, we observe the results of the Purcell effect enhancing the current peaks through the cavity by increasing the cavity–reservoir coupling, while they decrease with increasing electron–photon coupling. In addition, the resonant current peaks are also sensitive to the mean number of photons in the reservoir.
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Keywords:
quantum transport; quantum dot; cavity-quantum electrodynamics; quantum master equation; electro-optical effects
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MDPI and ACS Style
Abdullah, N.R.; Tang, C.-S.; Manolescu, A.; Gudmundsson, V. Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System. Nanomaterials 2019, 9, 1023.
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