Scanning gate microscopy of quantum rings: effects of an external magnetic field and of charged defects - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nanotechnology Année : 2009

Scanning gate microscopy of quantum rings: effects of an external magnetic field and of charged defects

Résumé

We study scanning gate microscopy (SGM) in open quantum rings obtained from buried semiconductor InGaAs/InAlAs heterostructures. By performing a theoretical analysis based on the Keldysh-Green function approach we interpret the radial fringes observed in experiments as the effect of randomly distributed charged defects. We associate SGM conductance images with the local density of states (LDOS) of the system. We show that such an association cannot be made with the current density distribution. By varying an external magnetic field we are able to reproduce recursive quasi-classical orbits in LDOS and conductance images, which bear the same periodicity as the Aharonov-Bohm effect.

Dates et versions

hal-00709514 , version 1 (18-06-2012)

Identifiants

Citer

M. G. Pala, S. Baltazar, F. Martins, B. Hackens, Hermann Sellier, et al.. Scanning gate microscopy of quantum rings: effects of an external magnetic field and of charged defects. Nanotechnology, 2009, 20 (26), pp.264021. ⟨10.1088/0957-4484/20/26/264021⟩. ⟨hal-00709514⟩
127 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More