Double and triple frequency oscillations observed in resonant tunneling spectroscopy through edge states around an antidot

Resonant tunneling through edge states bounded around an antidot in quantum Hall (QH) regime has been investigated and we have found multiple frequency oscillations in a resonant tunneling through an antidot. We have measured resistance as a function of magnetic field and front gate voltage and found the periodic oscillation in the ν = 2 to 1 transition regime. It is related that discrete energy levels are formed in the edge states around the antidot [1]. Not only single peaks but also some split peaks are seen in our data. Fourier power spectrum of the data shows double and triple frequency peak. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)