C. Eder et al., BALLISTIC-ELECTRON-EMISSION MICROSCOPY IN LIQUID-HELIUM USING LOW-DIMENSIONAL COLLECTOR ELECTRODES, Applied physics letters, 69(12), 1996, pp. 1725-1727
We report ballistic electron emission microscopy (BEEM) studies which
show that a GaAs/AlGaAs heterostructure provides a very efficient coll
ector electrode at 4.2 K. The enhanced thermal resolution at low tempe
rature is utilized to determine the BEEM current threshold behavior ve
ry accurately. We find that diffusive scattering processes dominate th
e carrier transport across the Au/GaAs interface. Quantum wire regions
on laterally structured samples are clearly identified with BEEM. The
BEEM current is strongly enhanced on top of the quantum wires. (C) 19
96 American Institute of Physics.