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

Katherine A. Schreiber (Autor)

Buch | Softcover

XIII, 101 Seiten

2020 | 1st ed. 2019
Springer International Publishing (Verlag)
978-3-030-26324-9 (ISBN)

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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 ni = 5/2 and ni = 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.

lt;p>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.

Chapter 1 Introduction.- Chapter 2 The Quantum Hall Nematic Phase.- Chapter 3 Low Temperature Measurement Techniques.- Chapter 4 The Quantum Hall Effect and Hydrostatic Pressure.- Chapter 5 The Fractional Quantum Hall State-to-Nematic Phase Transition Under Hydrostatic Pressure.- Chapter 6 Universality of the Fractional Quantum Hall State-to-Nematic Phase Transition at Half-Filling in the Second Landau Level.- Chapter 7 Origin of the Fractional Quantum Hall State-to-Nematic Phase Transition in the Second Landau Level.- References.

Erscheinungsdatum	22.09.2020
Reihe/Serie	Springer Theses
Zusatzinfo	XIII, 101 p. 50 illus., 39 illus. in color.
Verlagsort	Cham
Sprache	englisch
Maße	155 x 235 mm
Gewicht	191 g
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
	Naturwissenschaften ► Physik / Astronomie ► Festkörperphysik
	Naturwissenschaften ► Physik / Astronomie ► Thermodynamik
	Technik ► Maschinenbau
Schlagworte	composite fermion • fractional quantum hall state • fractional quantum Hall state-to-nematic phase transition • gallium arsenide • hydrostatic pressure • nematicity • quantum Hall nematic phase • quantum phase transition
ISBN-10	3-030-26324-X / 303026324X
ISBN-13	978-3-030-26324-9 / 9783030263249
Zustand	Neuware