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Download e-book for kindle: 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 positive aspects prolonged articles at the physics of electron units (especially semiconductor devices), particle optics at low and high energies, microlithography, photo technological know-how and electronic snapshot processing, electromagnetic wave propagation, electron microscopy, and the computing equipment utilized in these kinds of domain names.

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Extra resources for Advances in Imaging and Electron Physics, Vol. 107

Sample text

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. strongly suppressed on raising the temperature to above a degree Kelvin (Fig.

Arises due to the discrete distribution of donors in the AlGaAs layer (Nixon and Davies, 1990; Stopa, 1996a). The effect of these fluctuations should be to mix the otherwise discrete states of the dot, so that electrons may populate additional states that would otherwise remain inaccessible in transport (Altland and Gefen, 1995). In other words, while disorder is more normally thought of as giving rise to elastic scattering, by increasing the density of available states into which electrons may scatter, its presence may actually increase the dephasing rate in these dots.

1989). , 1992). When scattering between the trapped and transmitted edge states is possible, however, the latter provides an additional route for current flow through the dot and dramatic departures from Hall quantization may occur. In particular, a magnetically induced modulation of tunneling via the trapped edge states is found to give rise to Aharonov-Bohm oscillations and giant backscattering resonances, the properties of which we discuss in what follows. A . Aharonov-Bohrn Magneto-Resistance Oscillations An important consequence of confining edge states in quantum dots is that their energy becomes quantized into a discrete spectrum, successive states of 46 J.

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