40 research outputs found
Probing local electronic states in the quantum Hall regime with a side coupled quantum dot
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.Comment: 5 pages, 5 figure
Detection of spin polarization with a side coupled quantum dot
We propose realistic methods to detect local spin polarization, which utilize
a quantum dot side coupled to the target system. By choosing appropriate states
in the dot, we can put spin selectivity to the dot and detect spins in the
target with small disturbance. We also present an experiment which realizes one
of the proposed spin detection schemes in magnetic fields.Comment: 5 pages, 6 figure