Influence of lateral electric field on intraband optical absorption in concentric double quantum rings |
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| Institution: | 1. Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile;2. Department of Solid State Physics, Yerevan State University, Alex Manoogian 1, 0025 Yerevan, Armenia;3. National University of Architecture and Construction of Armenia, Teryan 105, 0009 Yerevan, Armenia;4. SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom;1. Semiconductor Research Lab, Department of Physics, Gurukula Kangri University, Haridwar, India;2. Department of Physics, University of the Free State, Bloemfontein, South Africa;1. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, Shandong, China;2. School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong, China;1. Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;2. Department of Physics, Lancaster University, LA1 4YB Lancaster, United Kingdom;1. Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany;2. Department of Theoretical Physics, Institute of Physics, Budapest University of Technology and Economics, HU-1521 Budapest, Hungary;3. Department of Physics, University of Oradea, 410087 Oradea, Romania |
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| Abstract: | The influence of lateral electric field on one-electron states and intraband absorption in two-dimensional concentric double quantum rings is investigated. The confining potential of the rings is modeled as a double harmonic central potential. Using the exact diagonalization technique, we calculate the dependence of the electron energy spectrum as a function of the electric field strength as well as the inner ring radius. Also, different values of confinement strength are considered. Selection rule is obtained for intraband transitions, caused by the direction of incident light polarization. The intraband absorption coefficient is calculated for different values of electric field strength, inner ring radius, confinement strength and incident light polarization direction. The combined influence of electric field strength and change of confining strength show that while the increment of the first one leads only to blueshift of absorption spectrum, the augment of the second one makes the redshift. In addition, both blueshift and redshift of the spectrum have been obtained with the enlargement of inner ring radius. Finally, we show that the absorption spectrum undergoes redshift by changing the polarization of incident light from x- to y-axis. |
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| Keywords: | Double quantum rings Optical properties Exact diagonalization method Electric field |
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