Pump-probe optical response of an asymmetric double quantum dot molecule |
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| Institution: | 1. Laboratoire Photonique Numérique et Nanosciences (LP2N), Université Bordeaux-IOGS-CNRS: UMR 5298, Talence, France;2. Materials Science Department, School of Natural Sciences, University of Patras, Patras 265 04, Greece;1. Department of Solid Mechanics and Design, Faculty of Mechanical Engineering, University Technology Malaysia – UTM, 81310 UTM Skudai, Johor, Malaysia;2. School of Engineering, Griffith University, Gold Coast Campus, Southport 4222, Australia;3. School of Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia;1. School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China;2. Department of Physics, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | We study the interaction of an asymmetric double semiconductor quantum dot molecule with a weak probe field and a strong pump field. We show that the optical properties of the system are controlled by a gate voltage and the pump field. For example, we find that the application of the pump field leads to controlled probe absorption, optical transparency, and gain for weak tunneling rates, while for stronger tunneling rates optical gain disappears and absorption spectra with double peaks are formed. |
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| Keywords: | Asymmetric quantum dot molecule Probe field Pump field Gate voltage Controlled probe absorption Optical transparency Gain |
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