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Ground States of the Two-Dimensional Electron System at Half-Filling under Hydrostatic Pressure

  • Book
  • © 2019

Overview

Authors:
  1. Katherine A. Schreiber

    1. National High Magnetic Field Laboratory - Pulsed Field Facility, Los Alamos National Laboratory, Los Alamos, USA

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  • Nominated as an outstanding PhD thesis by Purdue University
  • Includes an accessible introduction to fractional quantum Hall states
  • Provides new insights into the ? = 5/2 fractional quantum Hall state

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (7 chapters)

  1. Front Matter

    Pages i-xiii
    Download chapter PDF

  2. The Quantum Hall Effect

    • Katherine A. Schreiber
    Pages 1-24

  3. The Quantum Hall Nematic Phase

    • Katherine A. Schreiber
    Pages 25-36

  4. Low Temperature Measurement Techniques

    • Katherine A. Schreiber
    Pages 37-42

  5. The Quantum Hall Effect and Hydrostatic Pressure

    • Katherine A. Schreiber
    Pages 43-59

  6. The Fractional Quantum Hall State-to-Nematic Phase Transition Under Hydrostatic Pressure

    • Katherine A. Schreiber
    Pages 61-76

  7. Universality of the Fractional Quantum Hall State-to-Nematic Phase Transition at Half-Filling in the Second Landau Level

    • Katherine A. Schreiber
    Pages 77-89

  8. Origin of the Fractional Quantum Hall State-to-Nematic Phase Transition in the Second Landau Level

    • Katherine A. Schreiber
    Pages 91-101
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Keywords

About this book

This thesis presents the discovery of a surprising phase transition between a topological and a broken symmetry phase. Phase transitions between broken symmetry phases involve a change in symmetry and those between topological phases require a change in topological order; in rare cases, however, transitions may occur between these two broad classes of phases in which the vanishing of the topological order is accompanied by the emergence of a broken symmetry. This thesis describes observations of such a special phase transition in the two-dimensional electron gas confined in the GaAs/AlGaAs structures. When tuned by hydrostatic pressure, the ν = 5/2 and ν = 7/2 fractional quantum Hall states, believed to be prototypical non-Abelian topological phases of the Pfaffian universality class, give way to an electronic nematic phase. Remarkably, the fractional quantum Hall states involved are due to pairing of emergent particles called composite fermions. The findings reported here, therefore,provide an interesting example of competition of pairing and nematicity. This thesis provides an introduction to quantum Hall physics of the two-dimensional electron gas, contains details of the high pressure experiments, and offers a discussion of the ramifications and of the origins of the newly reported phase transition.

Authors and Affiliations

  • National High Magnetic Field Laboratory - Pulsed Field Facility, Los Alamos National Laboratory, Los Alamos, USA

    Katherine A. Schreiber

About the author

Katherine Schreiber is a postdoctoral researcher at the National High Magnetic Field Laboratory at Los Alamos National Laboratory. She received her PhD from Purdue University in 2018.

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