Detection of Coulomb charging around an antidot
Journal
Physica E: Low-Dimensional Systems and Nanostructures
Journal Volume
6
Journal Issue
1
Pages
495-498
Date Issued
2000
Author(s)
Abstract
We have detected oscillations of the charge around a potential hill (antidot) in a two-dimensional electron gas as a function of a perpendicular magnetic field B. The field confines electrons around the antidot in closed orbits, the areas of which are quantized through the Aharonov-Bohm effect. Increasing B reduces each state's area, pushing electrons closer to the centre, until enough charge builds up for an electron to tunnel out. This is a new form of the Coulomb blockade seen in electrostatically confined dots. We have also studied h/2e oscillations and found evidence for coupling of opposite spin states of the lowest Landau level.
Type
journal article