Directed electron transport through a ballistic quantum dot under microwave 
radiation

Zhang, J. Q.; Vitkalov, S.; Kvon, Z. D.; Portal, J. C.; Wieck, A.

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Directed electron transport through a ballistic quantum dot under microwave radiation

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Portal, J. C.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Zhang, J. Q., Vitkalov, S., Kvon, Z. D., Portal, J. C., & Wieck, A. (2006). Directed electron transport through a ballistic quantum dot under microwave radiation. Physical Review Letters, 97(22): 226807.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FEB0-D

Abstract

Rectification of microwave radiation by asymmetric ballistic dot is
studied at different frequencies (1-40 GHz), temperatures, and magnetic
fields. Dramatic reduction of the rectification is found in magnetic
fields at which the cyclotron radius of electron orbits at the Fermi
level is less than the size of the dot. With respect to the magnetic
field, both symmetric and antisymmetric contributions to the
rectification are presented. The symmetric part changes significantly
with microwave frequency omega at omega tau(f)>= 1, where tau(f) is the
time of the ballistic electron flight across the dot. The results lead
consistently towards the ballistic origin of the effect, and can be
explained by strongly nonlocal electron response to the microwave
electric field, which affects both speed and direction of the electron
motion inside the dot.