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30 Apr 2001

Volume 78, Issue 18, pp. 2617-2804

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Electron spectroscopy from solid-state field-controlled emission cathodes

Vu Thien Binh

Appl. Phys. Lett. 78, 2799 (2001); http://dx.doi.org/10.1063/1.1368370 (3 pages) | Cited 3 times

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Measured energy distributions of the electrons emitted from solid-state field-controlled emission (SSE) cathodes showed one-peak spectra having a specific profile and also a peak shift towards lower energies for increasing applied voltages. The peak shifts are related to an effective resistive behavior during the electron transport through the ultrathin wide-gap semiconductor (UTSC) layer prior to the emission. The analysis of the experimental energy distribution confirmed the main characteristics of the emission model for SSE cathodes, in particular the formation of injected space charges in the UTSC conduction band leading to a strong lowering of the surface barrier. © 2001 American Institute of Physics.
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79.70.+q Field emission, ionization, evaporation, and desorption

Simple model to study soliton wave propagation in periodic-loaded nonlinear transmission lines

F. Martín and X. Oriols

Appl. Phys. Lett. 78, 2802 (2001); http://dx.doi.org/10.1063/1.1369619 (3 pages) | Cited 3 times

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A model to study soliton propagation characteristics in nonlinear transmission lines (NLTLs) periodically loaded with voltage dependent capacitances is presented. This is based on the LC ladder equivalent network of the NLTL, and can be applied to structures where the Korteweg–de Vries approach does not hold. Specifically, the model allows to numerically obtain soliton waveforms under arbitrary capacitance non linearity. To demonstrate its validity, it has been applied to structures loaded with symmetric capacitances, similar to those exhibited by actual heterostructure barrier varactors. The model can be of help to understand harmonic generation in monolithic NLTL-based frequency multipliers. © 2001 American Institute of Physics.
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84.40.Az Waveguides, transmission lines, striplines
05.45.Yv Solitons
84.30.Bv Circuit theory
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