Aharonov-Bohm oscillations in a quantum ring:: Eccentricity and electric-field effects -: art. no. 125312

被引：62

作者：

Bruno-Alfonso, A

Latgé, A

机构：

[1] Univ Estadual Paulista, Fac Ciencias, Dept Matemat, BR-17033360 Bauru, SP, Brazil

[2] Univ Fed Fluminense, Inst Fis, BR-24210340 Niteroi, RJ, Brazil

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.71.125312

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：7

共 16 条

[1] Effect of an electric field on the Bohm-Aharonov oscillations in the electronic spectrum of a quantum ring [J].