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Imaging Quantum Hall Wavefunctions w...

Randeria, Mallika.

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Imaging Quantum Hall Wavefunctions with a Scanning Tunneling Microscope: From Spontaneous Symmetry Breaking to Interacting Domain Boundary Modes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Imaging Quantum Hall Wavefunctions with a Scanning Tunneling Microscope: From Spontaneous Symmetry Breaking to Interacting Domain Boundary Modes./
Author:	Randeria, Mallika.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	176 p.
Notes:	Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Contained By:	Dissertations Abstracts International81-04B.
Subject:	Condensed matter physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13886504
ISBN:	9781085649797

Imaging Quantum Hall Wavefunctions with a Scanning Tunneling Microscope: From Spontaneous Symmetry Breaking to Interacting Domain Boundary Modes.
Randeria, Mallika.

Imaging Quantum Hall Wavefunctions with a Scanning Tunneling Microscope: From Spontaneous Symmetry Breaking to Interacting Domain Boundary Modes. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 176 p.

Source: Dissertations Abstracts International, Volume: 81-04, Section: B.

Thesis (Ph.D.)--Princeton University, 2019.

This item must not be sold to any third party vendors.

Quantum materials provide a rich platform for realizing emergent phenomena, where interactions between electrons lead to properties that are strikingly different from those of individual electrons. Confining electrons to two dimensions and subjecting them to large magnetic fields enhances the effects of Coulomb interactions, which can manifest as a spontaneous lifting of spin, valley or other degeneracies in these quantum Hall systems. Experiments on a number of materials have primarily relied on global measurement techniques to explore this phase space, but locally imaging these broken-symmetry states has remained a challenge. With the useof a scanning tunneling microscope (STM), we directly visualize quantum Hall wavefunctions on the surface of a bismuth crystal, which enables us to probe the spatial signatures of spontaneous valley ordering. We identify the emergence of a nematic electronic phase, which breaks the rotational symmetry of the underlying crystal lattice, and a ferroelectric phase that carries an in-plane electric dipolemoment. Furthermore, we use the STM to investigate one-dimensional channels that form at the boundary between different valley-polarized quantum Hall states. We find markedly different regimes where these channels are either metallic or insulating, depending on constraints imposed on electron-electron interactions by the valley flavor. These experiments set the stage visualizing fractional quasiparticles in quantum Hall systems, and more generally for using local imaging techniques in future explorations of novel interaction-driven phenomena.

ISBN: 9781085649797Subjects--Topical Terms:

3173567
Condensed matter physics.
Subjects--Index Terms:

Bismuth

Imaging Quantum Hall Wavefunctions with a Scanning Tunneling Microscope: From Spontaneous Symmetry Breaking to Interacting Domain Boundary Modes.
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300 $a 176 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
500 $a Advisor: Yazdani, Ali.
502 $a Thesis (Ph.D.)--Princeton University, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Quantum materials provide a rich platform for realizing emergent phenomena, where interactions between electrons lead to properties that are strikingly different from those of individual electrons. Confining electrons to two dimensions and subjecting them to large magnetic fields enhances the effects of Coulomb interactions, which can manifest as a spontaneous lifting of spin, valley or other degeneracies in these quantum Hall systems. Experiments on a number of materials have primarily relied on global measurement techniques to explore this phase space, but locally imaging these broken-symmetry states has remained a challenge. With the useof a scanning tunneling microscope (STM), we directly visualize quantum Hall wavefunctions on the surface of a bismuth crystal, which enables us to probe the spatial signatures of spontaneous valley ordering. We identify the emergence of a nematic electronic phase, which breaks the rotational symmetry of the underlying crystal lattice, and a ferroelectric phase that carries an in-plane electric dipolemoment. Furthermore, we use the STM to investigate one-dimensional channels that form at the boundary between different valley-polarized quantum Hall states. We find markedly different regimes where these channels are either metallic or insulating, depending on constraints imposed on electron-electron interactions by the valley flavor. These experiments set the stage visualizing fractional quasiparticles in quantum Hall systems, and more generally for using local imaging techniques in future explorations of novel interaction-driven phenomena.
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