First-Principles Study of Electronic Structure and Optical Properties of Semiconductor Surfaces Unified Approach for Exact Calculation of Coupling Coefficients of Quantum Angular Momenta

Wei, Liqiang

Permalink

https://hdl.handle.net/2142/84440 Copy

Description

Title

First-Principles Study of Electronic Structure and Optical Properties of Semiconductor Surfaces Unified Approach for Exact Calculation of Coupling Coefficients of Quantum Angular Momenta

Author(s)

Wei, Liqiang

Issue Date

1998

Doctoral Committee Chair(s)

Y.-C. Chang

Department of Study

Chemistry

Discipline

Chemistry

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Physics, Elementary Particles and High Energy

Language

eng

Abstract

We present accurate results for the dynamics of an initially localized two-level (TLS) system coupled to a generic dissipative environment and driven by a periodic force which in the semiclassical limit is equivalent to a continuous-wave electromagnetic field. The time evolution is calculated via iterative evaluation of the path integral. We show that in the case where the temperature of the environment is high with respect to the energy splitting of the tunneling doublet, the delocalization rate is largely independent of the friction of the environment and of the specifics of the driving force, depending only on its overall strength. This robust behavior implies that localized states can be stabilized in these systems without much finetuning of external conditions. Our numerical results are interpreted in light of non-adiabatic rate theory.

Graduation Semester

1998

Type of Resource

text

Permalink

http://hdl.handle.net/2142/84440

Owning Collections