Phys. Rev. B 43, 12638–12641 (1991)Breakdown of quantized conductance in point contacts calculated using realistic potentialsReceived 13 August 1990; published in the issue dated 15 May 1991 Ionized donors in a heterostructure generate a random potential with long-ranged fluctuations. We have used realistic self-consistent potentials to study its effect on the quantized conductance of point contacts, and find that transport in confined and unconfined geometries probe complementary aspects of the random potential. Thus quantization breaks down when the length of the point contact exceeds 1/2 μm, an order of magnitude less than the mean free path in the bulk. The characteristics reflect the detailed configuration of impurities near the point contact. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.43.12638
DOI:
10.1103/PhysRevB.43.12638
PACS:
73.40.Kp, 72.20.Fr
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.