1
|
Mora-Ramos ME, Vinasco JA, Laroze D, Radu A, Restrepo RL, Heyn C, Tulupenko V, Hieu NN, Phuc HV, Ojeda JH, Morales AL, Duque CA. Electronic structure of vertically coupled quantum dot-ring heterostructures under applied electromagnetic probes. A finite-element approach. Sci Rep 2021; 11:4015. [PMID: 33597625 PMCID: PMC7889662 DOI: 10.1038/s41598-021-83583-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 02/04/2021] [Indexed: 11/21/2022] Open
Abstract
We theoretically investigate the electron and hole states in a semiconductor quantum dot-quantum ring coupled structure, inspired by the recent experimental report by Elborg and collaborators (2017). The finite element method constitutes the numerical technique used to solve the three-dimensional effective mass equation within the parabolic band approximation, including the effects of externally applied electric and magnetic fields. Initially, the features of conduction electron states in the proposed system appear discussed in detail, under different geometrical configurations and values of the intensity of the aforementioned electromagnetic probes. In the second part, the properties of an electron-hole pair confined within the very kind of structure reported in the reference above are investigated via a model that tries to reproduce as close as possible the developed profile. In accordance, we report on the energies of confined electron and hole, affected by the influence of an external electric field, revealing the possibility of field-induced separate spatial localization, which may result in an indirect exciton configuration. In relation with this fact, we present a preliminary analysis of such phenomenon via the calculation of the Coulomb integral.
Collapse
Affiliation(s)
- M E Mora-Ramos
- Centro de Investigación en Ciencias-IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62209 Cuernavaca, Morelos, Mexico.
| | - J A Vinasco
- Instituto de Alta Investigación, CEDENNA, Universidad de Tarapacá, Casilla 7D, Arica, Chile
| | - D Laroze
- Instituto de Alta Investigación, CEDENNA, Universidad de Tarapacá, Casilla 7D, Arica, Chile
| | - A Radu
- Department of Physics, University Politehnica of Bucharest, 313 Splaiul Independenţei, Bucharest, 060042, Romania
| | | | - Christian Heyn
- Center for Hybrid Nanostructures (CHyN), University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - V Tulupenko
- Donbass State Engineering Academy, Academichna str. 62, Kramatorsk, 84313, Ukraine.,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
| | - Nguyen N Hieu
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam.,Faculty of Natural Sciences, Duy Tan University, Da Nang, 550000, Viet Nam
| | - Huynh V Phuc
- Division of Theoretical Physics, Dong Thap University, Cao Lanh, 870000, Viet Nam
| | - J H Ojeda
- Grupo de Física de Materiales, Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia, Tunja, Boyacá, Colombia
| | - A L Morales
- 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
| | - C A Duque
- 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
| |
Collapse
|
2
|
Trallero-Giner C, Padilha JX, Lopez-Richard V, Marques GE, Castelano LK. Quantum well electronic states in a tilted magnetic field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:325503. [PMID: 28613209 DOI: 10.1088/1361-648x/aa798c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report the energy spectrum and the eigenstates of conduction and uncoupled valence bands of a quantum well under the influence of a tilted magnetic field. In the framework of the envelope approximation, we implement two analytical approaches to obtain the nontrivial solutions of the tilted magnetic field: (a) the Bubnov-Galerkin spectral method and b) the perturbation theory. We discuss the validity of each method for a broad range of magnetic field intensity and orientation as well as quantum well thickness. By estimating the accuracy of the perturbation method, we provide explicit analytical solutions for quantum wells in a tilted magnetic field configuration that can be employed to study several quantitative phenomena.
Collapse
Affiliation(s)
- C Trallero-Giner
- Department of Theoretical Physics, Havana University, Havana 10400, Cuba
| | | | | | | | | |
Collapse
|