Electron tunneling in chaotic InAs/GaAs quantum ring

Autor:	Filikhin, I., Matinyan, S. G., Vlahovic, B.
Rok vydání:	2012
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Nonlinear Sciences - Chaotic Dynamics
Druh dokumentu:	Working Paper
Popis:	Two dimensional InAs/GaAs quantum ring (QR) is considered using the effective potential approach. The symmetry of QR shape is violated as it is in the well-known Bohigas annular billiard. We calculate energy spectrum and studied the spatial localization of a single electron in such QR. For weak violation of the QR shape symmetry, the spectrum is presented as a set of quasi-doublets. Tunneling between quasi-doublet states is studied by the dependence on energy of the states. The dependence is changed with variation of the QR geometry that is related to the eccentricity of the QR. An interpretation of the experimental result obtained in [1] is proposed. We show that the "chaos-assisted tunneling" effect found in this paper can be explained by inter-band interactions occurred by anti-crossing of the levels with different "radial" quantum numbers. Comment: 13 pages, 10 figures; v.2, pages 13, figures 10. The relation between the anti-crossing, quantum chaos and tunneling is briefly stressed and clarified, one reference is added ([27]). The results were unchanged
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1211.1991 Zobrazit plný text záznamu View this record from Arxiv