The influence of a magnetic field on the energy spectrum of quasiparticles in the A2B6 quantum dot–protein bionanocomplex

Abstract

A mathematical model of the spherical A²B⁶ quantum dot with an impurity, which is in a magnetic field and interacts with adsorbed protein molecules, and is located in a uniform magnetic field, was constructed. Within the framework of the developed model, the influence of a uniform magnetic field on the energy spectrum of an electron, hole, and exciton in the semiconductor CdTe quantum dot–human serum albumin bionanocomplex has been investigated. The proposed model takes into account the polarization effects caused by the dipole potential of the protein shell, as well as spin splitting in a magnetic field. The regularities of change in the energy of quasiparticles on the radius of the quantum dot (undoped and with a donor or acceptor impurity), the concentration of albumin, and the magnitude of the magnetic field induction were established. It was established that with a decrease in the radius of the quantum dot, the influence of the protein shell becomes more significant. The influence of albumin and spin splitting in a magnetic field are enhanced in the presence of electrically active impurities. The obtained regularities indicate the possibility of controlling the optical and electrical properties of bionanocomplexes using an external magnetic field. The proposed results are important for the development of magnetosensitive biosensors and targeted drug delivery systems. Biohybrid structures quantum dot–protein can be used as fluorescent probes for visualization under the action of a magnetic field.