100 research outputs found
A Quantum Hall Bogoliubov Interferometer
A quantum Hall interferometer containing a grounded superconducting terminal
is proposed. This geometry allows to control the Andreev and normal scattering
amplitudes of sub-gap Bogoliubov quasiparticles with the Aharonov-Bohm phase,
as well as with the constrictions defining the interferometer loop. The
conductance matrix of a three-terminal interferometer exhibits a much richer
behavior as compared to its two-terminal Fabry-P\'erot counterpart. In
particular, an arbitrarily small Andreev reflection probability can be
resonantly enhanced up to 1 by the interference.Comment: revised discussion and interferometer sketche
Measuring electron energy distribution by current fluctuations
A recent concept of local noise sensor is extended to measure the energy
resolved electronic energy distribution at a given location
inside a non-equilibrium normal metal interconnect. A quantitative analysis of
is complicated because of a nonlinear differential resistance
of the noise sensor, represented by a diffusive InAs nanowire. Nevertheless, by
comparing the non-equilibrium results with reference equilibrium measurements,
we conclude that is indistinguishable from the Fermi
distribution
Nonequilibrium phenomena in adjacent electrically isolated nanostructures
We report on nonequilibrium interaction phenomena between adjacent but
electrostatically separated nanostructures in GaAs. A current flowing in one
externally biased nanostructure causes an excitation of electrons in a circuit
of a second nanostructure. As a result we observe a dc current generated in the
unbiased second nanostructure. The results can be qualitatively explained in
terms of acoustic phonon based energy transfer between the two mutually
isolated circuits.Comment: EP2DS-2007 proceedings; as publishe
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