Magnetism in Closed-shell Quantum Dots: Emergence of Magnetic Bipolarons

Details Magnetism in Closed-shell Quantum Dots: Emergence of Magnetic Bipolarons Magnetism in Closed-shell Quantum Dots: Emergence of Magnetic Bipolarons

2011-06-12

arxiv.org/abs/1106.2346v1

Phys. Rev. Lett. 106, 177201 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures; http://link.aps.org/doi/10.1103/PhysRevLett.106.177201; minor changes

Scientific paper

10.1103/PhysRevLett.106.177201

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.

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