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

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 beneficial properties prolonged articles at the physics of electron units (especially semiconductor devices), particle optics at low and high energies, microlithography, snapshot technological know-how and electronic photograph processing, electromagnetic wave propagation, electron microscopy, and the computing tools utilized in these kind of domain names.

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C. Zero-Field Magneto-Resistant Peak Another feature that may be observed in the magneto-resistance of open dots is a central peak at zero-field (Fig. , 1993). The study of this peak is often difficult at low temperatures, due to the obscuring effect of the surrounding fluctuations (Figs. , 1996). 25 MAGNETIC FIELD (TESLA) FIGURE 17. 4-pm split-gate quantum dot. The color scale ranges from red to blue, indicating low to high conductance, respectively. ) of a well-defined peak in such experiments reflects the influence of energy averaging on the discrete spectrum of the dot.

While a direct comparison to the form of Fig. 3 (in which the variation of magneto-conductance with energy is instead computed) cannot be made here, for now we are at least encouraged by observation of the well-defined striations that run through the experimental plot. Similar striations are also resolved in the numerical contours (Figs. , 1998b). Before a more detailed comparison of experiment and theory can be made, however, it will first be necessary to compute contour plots in which the influence of the gate voltage variation on the self-consistent profile of the dots is properly considered.

In this section, we therefore consider the manner in which this suppression arises. A . Temperature Dependence Characteristics of the Magneto- Conductance Fluctuations Reminiscent of the universal conductance fluctuations observed in disordered quantum wires (Lee 1987), the fluctuations in open dots are found to be 26 J. P. BIRD, R. AKIS, D. K. FERRY, AND M. 2 MAGNETIC FIELD (TESLA) FIWRE 20. Temperature dependence or the magneto-resistance of a 1-,urn split-gate quantum dot, measured in the region near zero magnetic field.

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