Unusual quantum confined Stark effect and Aharonov-Bohm oscillations in semiconductor quantum rings with anisotropic effective masses

G. O. De Sousa, D. R. Da Costa, Andrey Chaves, G. A. Farias, F. M. Peeters

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The effects of external electric and magnetic fields on the energy spectrum of quantum rings made out of a bidimensional semiconductor material with anisotropic band structures are investigated within the effective-mass model. The interplay between the effective-mass anisotropy and the radial confinement leads to wave functions that are strongly localized at two diametrically opposite regions where the kinetic energy is lowest due to the highest effective mass. We show that this quantum phenomenon has clear consequences on the behavior of the energy states in the presence of applied in-plane electric fields and out-of-plane magnetic fields. In the former, the quantum confined Stark effect is observed with either linear or quadratic shifts, depending on the direction of the applied field. As for the latter, the usual Aharonov-Bohm oscillations are not observed for a circularly symmetric confining potential, however they can be reinstated if an elliptic ring with an appropriate aspect ratio is chosen.

Original languageEnglish (US)
Article number205414
JournalPhysical Review B
Volume95
Issue number20
DOIs
StatePublished - May 11 2017
Externally publishedYes

Bibliographical note

Funding Information:
This work was financially supported by CNPq under the PRONEX/FUNCAP grants, CAPES Foundation, the Flemish Science Foundation (FWO-Vl), and the Brazilian Program Science Without Borders (CsF).

Publisher Copyright:
© 2017 American Physical Society.

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