Electronic States of Magnetic Quantum Dots

Abstract

We study quantum states of electrons in magnetically doped quantum dots as a function of exchange coupling between electron and impurity spins, the strength of Coulomb interaction, confining potential, and the number of electrons. The magnetic phase diagram of quantum dots, doped with a large number of magnetic Mn impurities, can be described by the energy gap in the spectrum of electrons and the mean field electron-Mn exchange coupling. A competition between these two parameters leads to a transition between spin-unpolarized and spin-polarized states, in the absence of applied magnetic field. Tuning the energy gap by electrostatic control of nonparabolicity of the confining potential can enable control of magnetization even at the fixed number of electrons. We illustrate our findings by directly comparing Mn-doped quantum dots with parabolic and Gaussian confining potential.

5 pages, 5 figures, Part of Focus on Spintronics in Reduced Dimensions

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• Semiconductor Spintronics
• Piezomagnetic Quantum Dots
• Designing a highly efficient graphene quantum spin heat engine
• Spin textures in strongly coupled electron spin and magnetic or nuclear spin systems in quantum dots
• Para-ortho transition of artificial H${}_2$ molecule in lateral quantum dots doped with magnetic impurities
• Optical orientation in bipolar spintronic devices
• Performance engineering of semiconductor spin qubit systems
• Dynamical Magnetic and Nuclear Polarization in Complex Spin Systems: Semi-magnetic II-VI Quantum Dots