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Physics - Condensed Matter Physics | Optical Properties of Bismuth-Based Topological Insulators

Optical Properties of Bismuth-Based Topological Insulators

Series: Springer Theses

Di Pietro, Paola

2014, X, 119 p. 78 illus., 36 illus. in color.

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  • Selected as best Materials Science PhD Thesis by the University of Rome - Sapienza
  • Reports the occurrence of two dimensional surface plasmons attributed to massless Dirac fermions at the insulator surface
  • Provides a comparison, obtained through FTIR spectroscopy, of the optical conductivity of Bi-based thin films and single crystals
  • Includes a comprehensive review of the fascinating properties of topological insulators with a particular emphasis on their optical behavior
Topological Insulators (TIs)  are insulators in the bulk, but have exotic metallic states at their surfaces. The topology, associated
with the electronic wavefunctions of these systems, changes when passing from the bulk to the surface.This work studies, by means of infrared spectroscopy, the low energy optical conductivity of Bismuth based TIs in order to identify the
extrinsic charge contribution of the bulk and to separate it from the intrinsic contribution of the surface state carriers. The extensive results presented in this thesis definitely shows the 2D character of the carriers in Bismuth-based topological insulators. The experimental apparatus and the FTIR technique, the theory of optical properties and Surface Plasmon Polaritons, as well as sample preparation of both crystals and thin films, and the analysis procedures are thoroughly described.

Content Level » Research

Keywords » ARPES Angle Resolved Photoemission Spectroscopy - CSR Coherent Synchrotron Radiation - FTIR Spectroscopy - Optical Conductivity - Plasmon Resonance - Quantum Hall Effect - RHEED Reflection High-energy Electron Diffraction - Spin-orbit Coupling - Surface Plasmon Polaritons - TDTS Time Domain Terahertz Spectroscopy - Time Reversal Symmetry - Topological Electrodynamics - Two Dimensional Electron Gas 2DEG

Related subjects » Characterization & Evaluation of Materials - Condensed Matter Physics - Materials - Optical & Electronic Materials - Surfaces, Interfaces, Thin Films, Corrosion, Coatings

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