Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-12
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
When two separately contacted quantum Hall (QH) edge channels are brought into interaction, they can equilibrate their imbalance via scattering processes. In the present work we use a tunable QH circuit to implement a junction between co-propagating edge channels whose length can be controlled with continuity. Such a variable device allows us to investigate how current-voltage characteristics evolve when the junction length d is changed. Recent experiments with fixed geometry reported a significant reduction of the threshold voltage for the onset of photon emission, whose origin is still under debate. Our spatially resolved measurements reveal that this threshold shift depends on the junction length. We discuss this unexpected result on the basis of a model which demonstrates that a heating of electrons is the dominant process responsible for the observed reduction of the threshold voltage.
Beltram Fabio
Biasiol Giorgio
Heun Stefan
Paradiso Nicola
Roddaro Stefano
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