Signal Processing

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 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 photo processing, electromagnetic wave propagation, electron microscopy, and the computing equipment utilized in a lot of these domain names.

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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. 21). The quantitative manner in which this quenching arises is found to be very different to that exhibited by disordered wires, however, and is thought to reflect the different nature of electron dynamics in these systems. , 1990, 1991).

The Aharonov-Bohm oscillations are rapidly quenched with increasing temperature and are typically no longer resolved by a degree Kelvin (Fig. 37). While we expect that both thermal averaging and phase breaking should be efficient in reducing the amplitude of the oscillations, the strong sensitivity to temperature that is apparent in Fig. 37 seems inconsistent with the effects of phase-breaking (see Fig. 25). , 1994b). 1. Aharonov-Bohm Oscillations: Precise Departures from hf e Periodicity A number of recent studies have shown that the Aharonov-Bohm oscillations in small dots may exhibit the phenomenon of frequency-doubling, which appears to result from the generation of two separate sets of h/e oscillations by opposite spin-branches of the same Landau level (Fig.

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. P. BIRD, R. AKIS, D. K. FERRY, A N D M. , 1989). In situations where the trapped edge states provide a tunneling route for current flow through the dot, its magneto-resistance is then found to exhibit a series of highly periodic oscillations, which may persist over wide ranges of magnetic field (Figs.

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