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On the Quantized Conductance of Small Contacts
Abstract The electron elastic conductance of small contacts on constrictions between 2-D reservoirs is investigated. Experimental results in two-dimensional electron gas (2 DEG) GaAs/GaAIAs structures show that this conductance, to a good approximation, is quantized. We present calculations for general geometries of the contacts that describe the experimental data reasonably well. Our calculations also show how the resonant scattering structure superimposed on the quantized conductance for some geometries tend to be washed out when the contacts are made smooth. Finally we discuss the interpretation of those experiments in terms of ballistic transport. Calculations using a first iterative selfconsistent procedure show that it may not be correct to use ballistic transport for all the modes in the constriction. The importance of the electronic mean free path concept in the constriction when compared with that of the reservoirs is also discussed. We conclude that for the higher mode in the constriction the transport may be sequential.
On the Quantized Conductance of Small Contacts
Abstract The electron elastic conductance of small contacts on constrictions between 2-D reservoirs is investigated. Experimental results in two-dimensional electron gas (2 DEG) GaAs/GaAIAs structures show that this conductance, to a good approximation, is quantized. We present calculations for general geometries of the contacts that describe the experimental data reasonably well. Our calculations also show how the resonant scattering structure superimposed on the quantized conductance for some geometries tend to be washed out when the contacts are made smooth. Finally we discuss the interpretation of those experiments in terms of ballistic transport. Calculations using a first iterative selfconsistent procedure show that it may not be correct to use ballistic transport for all the modes in the constriction. The importance of the electronic mean free path concept in the constriction when compared with that of the reservoirs is also discussed. We conclude that for the higher mode in the constriction the transport may be sequential.
On the Quantized Conductance of Small Contacts
Escapa, L. (author) / García, N. (author)
1990-01-01
14 pages
Article/Chapter (Book)
Electronic Resource
English
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