Resistance fluctuations in multiprobe microstructures: Length dependence and nonlocality

Visualization and investigation of the non-thermalized electrons in an InAs nanowire by scanning gate microscopy

We performed scanning gate microscopy measurements on an InAs nanowire at T  =  4.2 K in an external magnetic field. We visualizeded non-thermalized electrons passed under narrow metallic contact. It was found that, for such kind of electrons, suppression of the weak antilocalization quantum correction occurs with a magnetic field at least three times smaller than the corresponding one measured for the whole electronic system of the wire.

Measurement of the full distribution of persistent current in normal-metal rings

We have measured the persistent current in individual normal metal rings over a wide range of magnetic fields. From this data, we extract the first six cumulants of the single-ring persistent current distribution. Our results are consistent with the prediction that this distribution should be nearly Gaussian for diffusive metallic rings. This measurement highlights the sensitivity of persistent current to the mesoscopic fluctuations within a single isolated coherent volume.