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Optical Readout and Control of Corre...

Holtzmann, William G.,

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Optical Readout and Control of Correlated Electron Phases in 2D Semiconductor Moire Superlattices /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Optical Readout and Control of Correlated Electron Phases in 2D Semiconductor Moire Superlattices // William G Holtzmann.
Author:	Holtzmann, William G.,
Description:	1 electronic resource (103 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
Contained By:	Dissertations Abstracts International87-01B.
Subject:	Physics. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32116332
ISBN:	9798288823657

Optical Readout and Control of Correlated Electron Phases in 2D Semiconductor Moire Superlattices /
Holtzmann, William G.,

Optical Readout and Control of Correlated Electron Phases in 2D Semiconductor Moire Superlattices /William G Holtzmann. - 1 electronic resource (103 pages)

Source: Dissertations Abstracts International, Volume: 87-01, Section: B.

Ever since the isolation of the first single layer of a van der Waals material in 2004, the field of 2D materials has been continuously accelerating. The ever-growing list of correlated electronic phenomena observed in 2D materials, and in particular 2D moire systems, has created a sandbox for fundamental condensed matter research. Combined with the unique optoelectronic properties of the transition metal dichalcogenides (TMDs), we now have unprecedented access to correlated electronic phases with optical probes and optical controls. In this dissertation two main projects will be presented. First, Raman scattering experiments on WS2/WSe2 moire heterobilayers have revealed two emergent scattering modes that are as of now unidentified. These Raman modes show evidence of coupling with the underlying correlated physics in the moire system in addition numerous unusual and uncommon Raman signatures, including an anti-symmetric Raman tensor and a distinct excitation power dependence for the scattering cross section of the modes. Second, optical probes, and more importantly optical control, of the integer and fractional Chern insulator states in tMoTe2 will be presented. By leveraging the unique spin-valley-polarization coupling of the TMDs, we demonstrate the ability to deterministically choose the magnetization direction and thus sign of the Chern number for a domain encompassed by our optical pump. This represents the first step in optically controlling correlated electron phases in 2D materials rather than just optically probing them.

English

ISBN: 9798288823657Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

2D-materials

Optical Readout and Control of Correlated Electron Phases in 2D Semiconductor Moire Superlattices /
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245 1 0 $a Optical Readout and Control of Correlated Electron Phases in 2D Semiconductor Moire Superlattices / $c William G Holtzmann.
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500 $a Advisors: Xu, Xiaodong Committee members: Cobden, David; Cao, Ting.
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520 $a Ever since the isolation of the first single layer of a van der Waals material in 2004, the field of 2D materials has been continuously accelerating. The ever-growing list of correlated electronic phenomena observed in 2D materials, and in particular 2D moire systems, has created a sandbox for fundamental condensed matter research. Combined with the unique optoelectronic properties of the transition metal dichalcogenides (TMDs), we now have unprecedented access to correlated electronic phases with optical probes and optical controls. In this dissertation two main projects will be presented. First, Raman scattering experiments on WS2/WSe2 moire heterobilayers have revealed two emergent scattering modes that are as of now unidentified. These Raman modes show evidence of coupling with the underlying correlated physics in the moire system in addition numerous unusual and uncommon Raman signatures, including an anti-symmetric Raman tensor and a distinct excitation power dependence for the scattering cross section of the modes. Second, optical probes, and more importantly optical control, of the integer and fractional Chern insulator states in tMoTe2 will be presented. By leveraging the unique spin-valley-polarization coupling of the TMDs, we demonstrate the ability to deterministically choose the magnetization direction and thus sign of the Chern number for a domain encompassed by our optical pump. This represents the first step in optically controlling correlated electron phases in 2D materials rather than just optically probing them.
546 $a English
590 $a School code: 0250
650 4 $a Physics. $3 516296
650 4 $a Nanoscience. $3 587832
650 4 $a Electromagnetics. $3 3173223
653 $a 2D-materials
653 $a Optoelectronics
653 $a Topology
653 $a Transition metal dichalcogenides
653 $a Magnetization
690 $a 0605
690 $a 0565
690 $a 0607
710 2 $a University of Washington. $b Physics. $e degree granting institution. $3 3816472
720 1 $a Xu, Xiaodong $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 87-01B.
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791 $a Ph.D.
792 $a 2025
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