Quantum rings in tilted magnetic fields |
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Authors: | J. Planelles J.I. Climente F. Rajadell |
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Affiliation: | aDepartament de Ciències Experimentals, Universitat Jaume I, Box 224, E-12080 Castelló, Spain;bCNR-INFM S3, Via Campi 213/A, 41100 Modena, Italy |
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Abstract: | The electronic states of semiconductor quantum rings (QRs) under tilted magnetic fields are studied in the framework of the effective mass and envelope function approximations. For an axial field, the orbital Zeeman contribution prevails leading to the well-known Aharanov–Bohm spectrum, but it slowly decreases as the magnetic field direction declines. For an in-plane field, only the diamagnetic shift survives and it leads to the formation of double quantum well solutions, this result being relevant for experimental techniques which use in-plane magnetic fields to determine the spin of QR ground states. We also investigate the magnetic response of partially overlapped QRs, which are characteristic of high-density samples of self-assembled rings, and find that the spectrum is quite sensitive to ring coupling. |
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Keywords: | Quantum rings Electronic states Magnetization Tilted magnetic field |
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