Time-dependent Photomodulation of a Single Atom Tungsten Tip Tunnelling Barrier

• Main Author: Zia, Haider
• Other Authors: Miller, Dwayne
• Language: en_ca
• Published: 2010
• Subjects: Photoemission; Tungsten; general solution to partial differential equations; Schrodinger equation; Field emission; Fowler-Nordheim; photomodulation; solving complex band structure; 0494
• Online Access: http://hdl.handle.net/1807/25733

There has been much work on electron emission. It has lead to the concept of the photon and new electron sources for imaging such as electron microscopes and the rst formulation of holographic reconstructions [1-6]. Analytical derivations are important to gain physical insight into the problem of developing better electron sources. However, to date, such formulations have su ered by a number of approximations that have masked important physics. In this thesis, a new approach is provided that solves the Schrodinger wave equation for photoemission from a single atom tungsten tip barrier or more generally, for photoemission from a Schottky triangular barrier potential, with or without image potential e ects. We describe the system, then introduce the mathematical derivation. We conclude with the applications of the theory.