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Stark-shift of impurity fundamental state in a lens shaped quantum dot
Affiliation:1. Équipe de recherche en thérmique et energy, ENSET, Rabat, Mohammed V University in Rabat, Morocco;2. Group of Optoelectronic of Semiconductors and Nanomaterials, ENSET, Rabat, Mohammed V University in Rabat, Morocco;3. LCP-A2MC, Institut de Chimie, Physique et Matériaux Université de Lorraine, Metz, France;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. Russian - Armenian University, H. Emin 123, 0051, Yerevan, Armenia;2. Yerevan State University, A. Manoogian 1, 0025, Yerevan, Armenia;3. Peter The Great Saint-Petersburg Polytechnic University, Russia;1. Zarghan Branch, Islamic Azad University, Zarghan, Iran;2. Department of Physics, College of Sciences, Shiraz University, Shiraz 71454, Iran;1. Universidad de los Llanos, Departamento de Matemáticas y Física, Facultad de Ciencias básicas e Ingeniería, Colombia;2. Instituto de Física, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;3. Universidad de Sucre, Departamento de Física, Facultad de Educación y Ciencias, Colombia
Abstract:We calculate the Stark effect and the polarisability of shallow-donor impurity located in the centre of lens shaped quantum dot by a variational method and in the effective-mass approximation. Our theoretical model assumes an infinite confinement to describe the barriers at the dot boundaries and the electric field is considered to be applied in the z-direction. The systematic theoretical investigation contains results with the quantum dot size and the strength of the external field. Our calculations reveal that the interval wherein the polarisability varies depends strongly on the dot size.
Keywords:Lens shaped quantum dot  Stark effect  Polarisability
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