Artículos de revistas
Aharonov-Bohm oscillations in a quantum ring: Eccentricity and electric-field effects
Fecha
2005-03-15Registro en:
Physical Review B - Condensed Matter and Materials Physics, v. 71, n. 12, 2005.
1098-0121
1550-235X
10.1103/PhysRevB.71.125312
2-s2.0-20044393897
Autor
Universidade Estadual Paulista (UNESP)
Universidade Federal Fluminense (UFF)
Institución
Resumen
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. ©2005 The American Physical Society.