Wave function and conductance calculations for a quantum dot at resonant tunnelling peaks
UNSPECIFIED (1996) Wave function and conductance calculations for a quantum dot at resonant tunnelling peaks. In: 11th International Conference on the Electronic Properties of 2-Dimensional Systems (EP2DS XI), UNIV NOTTINGHAM, NOTTINGHAM, ENGLAND, AUG 07-11, 1995. Published in: Surface Science, 362 (1-3). pp. 640-643.Full text not available from this repository.
We use a recently developed numerical matching procedure to calculate conductances g(12) and scattering wave functions psi for a quantum dot. The dot is formed in a 2D quantum wire by pushing in two hard wall fingers with height h, width d and separation s. Calculations are made for rectangular and capped fingers when d/w=0.1, s/w=0.47 and h/w=0.70, 0.60 and 0.53. We find two resonant tunnelling peaks in g(12) below the transmission threshold at wave numbers which decrease with decreasing h/w. We use contour plots of \psi\(2) to show that this behaviour when h decreases is due to increasing ''spillage'' of \psi\(2) over the tops of the fingers and above the space between them. The higher resonance finally merges with the first continuous region of strong transmission.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QD Chemistry
Q Science > QC Physics
|Journal or Publication Title:||Surface Science|
|Publisher:||ELSEVIER SCIENCE BV|
|Number of Pages:||4|
|Page Range:||pp. 640-643|
|Title of Event:||11th International Conference on the Electronic Properties of 2-Dimensional Systems (EP2DS XI)|
|Location of Event:||UNIV NOTTINGHAM, NOTTINGHAM, ENGLAND|
|Date(s) of Event:||AUG 07-11, 1995|
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