Magnetism in Closed-shell Quantum Dots: Emergence of Magnetic Bipolarons
arXiv:1106.2346 · doi:10.1103/PhysRevLett.106.177201
Abstract
Similar to atoms and nuclei, semiconductor quantum dots exhibit formation of shells. Predictions of magnetic behavior of the dots are often based on the shell occupancies. Thus, closed-shell quantum dots are assumed to be inherently nonmagnetic. Here, we propose a possibility of magnetism in such dots doped with magnetic impurities. On the example of the system of two interacting fermions, the simplest embodiment of the closed-shell structure, we demonstrate the emergence of a novel broken-symmetry ground state that is neither spin-singlet nor spin-triplet. We propose experimental tests of our predictions and the magnetic-dot structures to perform them.
arXiv comment4 pages, 4 figures; http://link.aps.org/doi/10.1103/PhysRevLett.106.177201; minor changes
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- Spin textures in strongly coupled electron spin and magnetic or nuclear spin systems in quantum dots
- Nodal "ground states" and orbital textures in semiconductor quantum dots
- Spin-orbit coupled particle in a spin bath
- Magnetic ordering in quantum dots: Open vs. closed shells
- Small quantum dots of diluted magnetic III-V semiconductor compound