DUAL-BRANCH ELECTRON WAVE-GUIDE COUPLERS

Citation
O. Vanbesien et D. Lippens, DUAL-BRANCH ELECTRON WAVE-GUIDE COUPLERS, Materials science & engineering. B, Solid-state materials for advanced technology, 35(1-3), 1995, pp. 90-96
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science","Physics, Condensed Matter
ISSN journal
0921-5107
Volume
35
Issue
1-3
Year of publication
1995
Pages
90 - 96
Database
ISI
SICI code
0921-5107(1995)35:1-3<90:DEWC>2.0.ZU;2-H
Abstract
A quantum directional coupler which consists of two electron waveguide s interconnected by a dual branch line scheme is analysed. With respec t to a structure with a single interaction window, the crucial advanta ge is that the phase in the output leads can be strongly modulated thr ough the distinct coupling paths. As a consequence, the proposed struc ture is highly directive in a four-terminal configuration. In order to address the above idea, a theoretical analysis is conducted by solvin g the two-dimensional Schrodinger equation using a mode matching techn ique. Transmission spectra and conductance variations are calculated a nd various modes of operation are pointed out, notably a 3 dB coupling situation, a real space transfer with over 90% of transferred electro ns and a coupling by evanescent modes. Finally the time response of me chanisms is briefly discussed by viewing the transfer of an electron a s a resonance process.