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Measuring current by counting electrons in a nanowire quantum dot
S. Gustavsson, I. Shorubalko, R. Leturcq +2
We measure current by counting single electrons tunneling through an InAs nanowire quantum dot. The charge detector is realized by fabricating a quantum point contact in close vici…
Two-dimensional imaging of the spin-orbit effective magnetic field
L. Meier, G. Salis, E. Gini +2
We report on spatially resolved measurements of the spin-orbit effective magnetic field in a GaAs/InGaAs quantum-well. Biased gate electrodes lead to an electric-field distribution…
Self-aligned charge read-out for InAs nanowire quantum dots
I. Shorubalko, R. Leturcq, A. Pfund +4
A highly sensitive charge detector is realized for a quantum dot in an InAs nanowire. We have developed a self-aligned etching process to fabricate in a single step a quantum point…
Hysteretic magnetotransport in p-type AlGaAs heterostructures with In/Zn/Au ohmic contacts
B. Grbic, R. Leturcq, T. Ihn +4
The two-terminal magneto-conductance of a hole gas in C-doped AlGaAs/GaAs heterostructures with ohmic contacts consisting of alloyed In/Zn/Au displays a pronounced hysteresis of th…
Strong spin-orbit interactions and weak antilocalization in carbon doped p-type GaAs heterostructures
Boris Grbic, Renaud Leturcq, Thomas Ihn +3
We present a comprehensive study of the low-field magnetoresistance in carbon doped p-type GaAs/AlGaAs heterostructures aiming at the investigation of spin-orbit interaction effect…
Aharonov-Bohm oscillations in p-type GaAs quantum rings
Boris Grbic, Renaud Leturcq, Thomas Ihn +3
We have explored phase coherent transport of holes in two p-type GaAs quantum rings with orbital radii 420 nm and 160 nm fabricated with AFM oxidation lithography. Highly visible A…