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Instabilities in quantum point contact structures

✍ Scribed by M.N. Wybourne; Jolinda C. Smith; C. Berven; R. Ramasubramaniam; S.M. Goodnick

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
220 KB
Volume
20
Category
Article
ISSN
0749-6036

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✦ Synopsis

We discuss the appearance of strong nonlinearities including S-type negative differential conductance in the I -V characteristics of quantum point contact (QPC) structures. Timedependent measurements demonstrate that the highly nonlinear d.c. I -V features are associated with a temporal average of random telegraph switching (RTS) between different current levels. The RTS is only observed when the voltage across the device is such that the chemical potential on one side of the QPC is aligned with the bottom of a one-dimensional subband in the QPC. As the chemical potential is moved further into the subband, the switching behavior disappears until the next subband minimum is reached.

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