Quantum effects in linear and non-linear transport of T-shaped ballistic junction

Details Quantum effects in linear and non-linear transport of T-shaped ballistic junction Quantum effects in linear and non-linear transport of T-shaped ballistic junction

2009-12-10

arxiv.org/abs/0912.2004v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We report low-temperature transport measurements of three-terminal T-shaped device patterned from GaAs/AlGaAs heterostructure. We demonstrate the mode branching and bend resistance effects predicted by numerical modeling for linear conductance data. We show also that the backscattering at the junction area depends on the wave function parity. We find evidence that in a non-linear transport regime the voltage of floating electrode always increases as a function of push-pull polarization. Such anomalous effect occurs for the symmetric device, provided the applied voltage is less than the Fermi energy in equilibrium.

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