Noise-driven optical absorption coefficients of impurity doped quantum dots |
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| Affiliation: | 1. Department of Chemistry, Brahmankhanda Basapara High School, Basapara, Birbhum 731215, West Bengal, India;2. Department of Chemistry, Bishnupur Ramananda College, Bishnupur, Bankura 722122, West Bengal, India;3. Department of Chemistry, Hetampur Raj High School, Hetampur, Birbhum 731124, West Bengal, India;4. Department of Chemistry, Physical Chemistry Section, Visva Bharati University, Santiniketan, Birbhum 731 235, West Bengal, India;1. Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran;2. Zarghan Branch, Islamic Azad University, Zarghan, Iran;1. OAPM Group, Laboratory of Materials, Waves, Energy and Environment, Department of Physics, Faculty of Sciences, University Mohamed I, 60000, Oujda, Morocco;2. Laboratory of Innovation in Science, Technologie and Education, CRMEF, Oujda, 60000, Morocco;3. Instituto de Alta Investigación, CEDENNA, Universidad de Tarapacá, Casilla 7D, Arica, Chile;4. Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;1. Physics Department, “Politehnica” University of Bucharest, Romania;2. Faculty of Physics, University of Bucharest, P.O. Box MG 11 Bucharest, Romania;1. Cumhuriyet University, Physics Department, 58140 Sivas, Turkey;2. Dokuz Eylül University, Physics Department, 35160 Buca, İzmir, Turkey;3. Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Ave. Universidad 1001, CP 62209, Cuernavaca, Morelos, Mexico;4. Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia |
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| Abstract: | We make an extensive investigation of linear, third-order nonlinear, and total optical absorption coefficients (ACs) of impurity doped quantum dots (QDs) in presence and absence of noise. The noise invoked in the present study is a Gaussian white noise. The quantum dot is doped with repulsive Gaussian impurity. Noise has been introduced to the system additively and multiplicatively. A perpendicular magnetic field acts as a source of confinement and a static external electric field has been applied. The AC profiles have been studied as a function of incident photon energy when several important parameters such as optical intensity, electric field strength, magnetic field strength, confinement energy, dopant location, relaxation time, Al concentration, dopant potential, and noise strength take on different values. In addition, the role of mode of application of noise (additive/multiplicative) on the AC profiles has also been analyzed meticulously. The AC profiles often consist of a number of interesting observations such as one photon resonance enhancement, shift of AC peak position, variation of AC peak intensity, and bleaching of AC peak. However, presence of noise alters the features of AC profiles and leads to some interesting manifestations. Multiplicative noise brings about more complexity in the AC profiles than its additive counterpart. The observations indeed illuminate several useful aspects in the study of linear and nonlinear optical properties of doped QD systems, specially in presence of noise. The findings are expected to be quite relevant from a technological perspective. |
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| Keywords: | Quantum dot Impurity Gaussian white noise Absorption coefficients Noise strength |
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