Pyramidal core-shell quantum dot under applied electric and magnetic fields

被引：31

作者：

Osorio, J. A. ^{[1
]}

Caicedo-Paredes, D. ^{[2
]}

Vinasco, J. A. ^{[1
]}

Morales, A. L. ^{[1
]}

Radu, A. ^{[3
]}

Restrepo, R. L. ^{[4
]}

Martinez-Orozco, J. C. ^{[5
]}

Tiutiunnyk, A. ^{[6
]}

Laroze, D. ^{[6
]}

Hieu, Nguyen N. ^{[7
]}

Phuc, Huynh, V ^{[8
]}

Mora-Ramos, M. E. ^{[1
,9
]}

Duque, C. A. ^{[1
]}

机构：

[1] Univ Antioquia UdeA, Fac Ciencias Exactas & Nat, Inst Fis, Grp Mat Condensada UdeA, Calle 70 52-21, Medellin, Colombia

[2] Univ Antioquia UdeA, Fac Ingn, Calle 70 52-21, Medellin, Colombia

[3] Univ Politehn Bucuresti, Dept Phys, 313 Splaiul Independentei, RO-060042 Bucharest, Romania

[4] Univ EIA, Envigado 055428, Colombia

[5] Univ Autonoma Zacatecas, Unidad Acad Fis, Calzada Solidaridad Esquina Con Paseo Bufa S-N, Zacatecas 98060, Zacatecas, Mexico

[6] Univ Tarapaca, CEDENNA, Inst Alta Invest, Casilla 7D, Arica, Chile

[7] Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam

[8] Dong Thap Univ, Div Theoret Phys, Cao Lanh 870000, Vietnam

[9] Univ Autonoma Estado Morelos, Ctr Invest Ciencias IICBA, Av Univ 1001, Cuernavaca 62209, Morelos, Mexico

来源：

SCIENTIFIC REPORTS | 2020年 / 10卷 / 01期

关键词：

WETTING LAYER; SINGLE DOPANT; IMPURITY; BAND; EXCITON; ENERGY; STATES;

D O I：

10.1038/s41598-020-65442-x

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We have theoretically investigated the electronic states in a core/shell pyramidal quantum dot with GaAs core embedded in AlGaAs matrix. This system has a quite similar recent experimental realization through a cone/shell structure [Phys. Status Solidi-RRL 13, 1800245 (2018)]. The research has been performed within the effective mass approximation taking into account position-dependent effective masses and the presence of external electric and magnetic fields. For the numerical solution of the resulting three-dimensional partial differential equation we have used a finite element method. A detailed study of the conduction band states wave functions and their associated energy levels is presented, with the analysis of the effect of the geometry and the external probes. The calculation of the non-permanent electric polarization via the off-diagonal intraband dipole moment matrix elements allows to consider the related optical response by evaluating the coefficients of light absorption and relative refractive index changes, under different applied magnetic field configurations.

引用

页数：14

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