Nanoscale physics

Magnetic field effect on the optical properties core-shell type II quantum dot 
Holovatsky V. A.1, Chubrei M. V.1, Duque C. A.2
1 Department of Theoretical Physics and Computer Modelling, Chernivtsi National University after Yuriy Fed’kovych. Kotsiubynsky str, 2, Chernivtsi-58002, Ukraine 
2 Grupo de Materia Condensada-UdeA, Facultad de Ciencias Exactas y Naturales, Instituto de Física, Universidad de Antioquia, Medellín AA 1226, Colombia
E-mail: v.holovatsky@chnu.edu.ua
This study presents a simple model within the effective mass approximation to describe the magnetic field impact on the energy structure and interband optical quantum transitions in type-II ZnTe/CdSe spherical quantum dots. The dependencies energy spectra and wave functions of an electron and hole on the magnetic field are calculated by the diagonalization method for spherical quantum dots different sizes. 
It is shown that the magnetic field violates the spherical symmetry of the system and takes off the degeneration of energy spectrum with respect to the magnetic quantum number. The energy of the electron in the states with m≥0 increases when magnetic field enhances; for the states with m<0 these dependences are non-monotonous (decreasing at first and then increasing). Moreover, the ground state of electron, which localized in the spherical shell CdSe, is formed alternately by the lowest states m=0, -1, -2, … with increasing the induction of magnetic field [1-2] (Aharonov Bohm effect). The hole is localized in the core and it ground state m=0 at all range magnetic field value.
The absorption coefficient and oscillator strength of the quantum transitions are calculated as function of the magnetic field induction [3].

1.	Holovatsky V., Voitsekhivska O., Bernik I. Effect of magnetic field on electron spectrum in spherical nano-structures// Condens. Matter Phys.-2014.- 17, N 1, P.13702.
2.	Holovatsky V., Bernik I., Yakhnevych M. Effect of magnetic field on electron spectrum and probabilities of intraband quantum transitions in spherical quantum-dot-quantum-well// Phys. E Low-Dimensional Syst. Nanostructures.-2016.-83, P.256-262.
3.	Al E. B., Kasapoglu E., Sakiroglu S., Sari H., Sökmen I., Duque C. A. Binding energies and optical absorption of donor impurities in spherical quantum dot under applied magnetic field// Phys. E Low-Dimensional Syst. Nanostructures.-2020.-119, 114011.