Probing local electronic states in the quantum Hall regime with a side coupled quantum dot

Abstract

We demonstrate a new method for locally probing the edge states in the quantum Hall regime utilizing a side coupled quantum dot positioned at an edge of a Hall bar. By measuring the tunneling of electrons from the edge states into the dot, we acquire information on the local electrochemical potential and electron temperature of the edge states. Furthermore, this method allows us to observe the spatial modulation of the electrostatic potential at the edge state due to many-body screening effect.

5 pages, 5 figures

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• Statistical theory of relaxation of high energy electrons in quantum Hall edge states
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• Fast probe of local electronic states in nanostructures utilizing a single-lead quantum dot
• Measurement of energy relaxation in quantum Hall edge states utilizing quantum point contacts
• Decoherence of high-energy electrons in weakly disordered quantum Hall edge states