Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 12, Issue 8, Pages L167-L172Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/12/8/102
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We report on the use of a low-temperature scanning probe microscope to investigate non-equilibrium electronic transport through a one-dimensional ballistic constriction. Trans-conductance images of electrons backscattered in the adjoining two-dimensional reservoirs show a weak acceptance cone consistent with semiclassical collimation. The images also show a strong highly collimated beam of quasi-particles injected into each reservoir with a divergence consistent with quantum mechanical diffraction. In the lower-chemical-potential reservoir these quasi-particles are interpreted as hot electrons while in the higher-chemical-potential reservoir they are interpreted as conduction-band holes.
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