Shell structure of a circular quantum dot in weak magnetic fields
Zeitschrift für Physik B Condensed Matter(2014)
Abstract
The conductance of a circular quantum dot in a two-dimensional electron gas of a GaAlAs/GaAs heterostructure has been measured. Conductance oscillations as functions both of the magnetic field B and of the size of a dot confining about 1000 electrons are related to the formation of electronic shell structure. Modeling the dot by a circular billiard, we interpret the results semiclassically in terms of periodic orbit theory, providing a simple explanation of the B -periodic oscillations. A comparison to a harmonic confinement suitable for smaller quantum dots is given.
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Key words
Periodic Orbit,Gate Voltage,Level Density,Trace Formula,Quantum Point Contact
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