Edge-state velocity and coherence in a quantum Hall Fabry-Pérot interferometer.
We investigate nonlinear transport in electronic Fabry-Pérot interferometers in the integer quantum Hall regime. For interferometers sufficiently large that Coulomb blockade effects are absent, a checkerboardlike pattern of conductance oscillations as a function of dc bias and perpendicular magnetic field is observed. Edge-state velocities extracted from the checkerboard data are compared to model calculations and found to be consistent with a crossover from skipping orbits at low fields to E-vector x B-vector drift at high fields. Suppression of visibility as a function of bias and magnetic field is accounted for by including energy- and field-dependent dephasing of edge electrons.
McClure
D T
DT
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Zhang
Yiming
Y
Rosenow
B
B
Levenson-Falk
E M
EM
Marcus
C M
CM
Pfeiffer
L N
LN
West
K W
KW