Persistent current induced by vacuum fluctuations in a quantum ring
arXiv:1305.1553 · doi:10.1103/PhysRevB.87.245437
Abstract
We study theoretically interaction between electrons in a quantum ring embedded in a microcavity and vacuum fluctuations of electromagnetic field in the cavity. It is shown that the vacuum fluctuations can split electron states of the ring with opposite angular momenta. As a consequence, the ground state of electron system in the quantum ring can be associated to nonzero electric current. Since a ground-state current flows without dissipation, such a quantum ring gets a magnetic moment and can be treated as an artificial spin.
7 pages, 2 figures; published version
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