Magnetic Field Dependence of Excitonic and Optical Properties of InP/ZnS Core/Shell Nanostructure
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https://doi.org/10.1007/s11664-020-08487-y 2020 The Minerals, Metals & Materials Society
Magnetic Field Dependence of Excitonic and Optical Properties of InP/ZnS Core/Shell Nanostructure A. JOHN PETER
,1,4 M. ELAMATHI,2 and CHANG WOO LEE3,5
1.—PG and Research Department of Physics, Government Arts College, Melur, Madurai 625 106, India. 2.—Department of Physics, Saiva Bhanu Kshatriya College, Aruppukkottai 626101, India. 3.—Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1732 Deogyeong-daero, Gihung, Yongin, Gyeonggi 446-701, South Korea. 4.—e-mail: [email protected]. 5.—e-mail: [email protected]
The effect of a magnetic field on the excitonic and optical properties of an InP/ ZnS core/shell nanodot (type I) including the influence of the geometrical confinement effect has been investigated. The exciton binding energy, oscillator strength, linear and nonlinear electronic and optical absorption coefficients, electronic dipole moment, and optical gain are studied for different ratios of the core/shell dot radii with and without the application of a magnetic field. The variational formalism is employed to obtain the electronic properties, whereas a compact density matrix method is applied to determine the optical properties. It is observed that the exciton binding energy is enhanced as the core/shell ratio tends to unity, attempting to reach its well-known twodimensional (2D) limit. The application of a magnetic field shifts the peak to higher energies. The combined effects of a magnetic field and spatial confinement lead to control over the electronic as well as optical properties. These results will be useful for enhancing the performance of such structures for any desired potential application in optical devices. Key words: Core/shell quantum dot, absorption coefficient, optical gain
INTRODUCTION Core/shell quantum dots have major roles to play in potential optoelectronic applications, especially the production of nano-based optoelectronic devices, for example, ultrafast switching devices and sensors.1,2 Tunable emission brightness will lead to the fabrication of novel efficient core/shell quantum dots to improve the physical and mechanical properties of nanosized heterostructures. It is thus imperative to comprehend the behavior of excitons in such nanostructured materials. Furthermore, tuning the spatial confinement and the application of external perturbations can be used to control both their electronic and optical properties.3–5 Efficient core/ shell quantum dots have been realized and broadly
(Received June 17, 2020; accepted September 12, 2020)
studied with recent technological advances that have enabled the production of nanomaterials of desired size.6,7 The unique electronic and optical properties exhibited by such nanostructured semiconducting materials arise due to the influence of external perturbations and the quantum confinement effect, and these properties can be applied directly in novel optoelectronic devices.8 Enhanced electronic and optical proper
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