Advances in Imaging and Electron Physics, Vol. 107 by Peter W. Hawkes (Ed.)

By Peter W. Hawkes (Ed.)

Advances in Imaging & Electron Physics merges long-running serials--Advances in Electronics & Electron Physics and Advances in Optical & Electron Microscopy . The sequence good points prolonged articles at the physics of electron units (especially semiconductor devices), particle optics at low and high energies, microlithography, picture technology and electronic snapshot processing, electromagnetic wave propagation, electron microscopy, and the computing equipment utilized in some of these domain names.

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As the associated wavefunction scarring implies a highly nonuniform sampling of phase space within these dots, an important conclusion is therefore that chaotic scattering is suppressed in open quantum dots when their discrete quantum mechanical nature becomes suficiently resolved. B. Probing Wavefunction Scarring at Zero Mugneric Field As magneto-transport studies reveal a highly selective nature to electron transport in open dots, a natural question now arises as to whether this 17 MAGNETO-TRANSPORT AS A PROBE OF ELECTRON DYNAMICS 2 0 0 50 100 MAGNETIC FREQUENCY (PERTESlA) 150 FIGUREI I.

1997a1. , 1998a). We do note from this figure, however, that the value of the phase-breaking time in this high resistance regime shows considerable variations from one dot to another, which do not appear to follow any well-defined scaling with dot size. The influence of environmental coupling on the behavior of mesoscopic devices has been widely considered in the literature. For the open dots of interest here, we expect that the phase-breaking rate should be proportional to the number of available states that electrons may access during transport.

In Fig. 31, we show how the lineshape of this peak varies as we increase the energy range over which the average magneto-resistance is computed. While the geometry of the dot itself is held constant here, a transition between Lorentzian and linear lineshapes may nonetheless be resolved (see also Fig. 32). , 1998b). Based on these findings, we therefore conclude that the lineshape of the zero-field peak does not provide a reliable indicator of chaos in open dots! Instead, the observation of this peak is thought to reflect the fact that the transport properties of these dots are dominated by the details of their energy spectra, even at temperatures where specific spectral features may no longer be resolved.

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