Aharonov-Bohm oscillations in a quantum ring: Eccentricity and electric-field effects
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Data
2005-03-01
Autores
Bruno-Alfonso, A.
Latge, A.
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American Physical Soc
Resumo
The effects of an in-plane electric field and eccentricity on the electronic spectrum of a GaAs quantum ring in a perpendicular magnetic field are studied. The effective-mass equation is solved by two different methods: an adiabatic approximation and a diagonalization procedure after a conformal mapping. It is shown that the electric field and the eccentricity may suppress the Aharonov-Bohm oscillations of the lower energy levels. Simple expressions for the threshold energy and the number of flat energy bands are found. In the case of a thin and eccentric ring, the intensity of a critical field which compensates the main effects of eccentricity is determined. The energy spectra are found in qualitative agreement with previous experimental and theoretical works on anisotropic rings.
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Physical Review B. College Pk: American Physical Soc, v. 71, n. 12, 7 p., 2005.