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Nano-Engineering of Atomically Thin Novel 2D Materials and their Heterostructures.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Nano-Engineering of Atomically Thin Novel 2D Materials and their Heterostructures./
Author:	Rahman, Sharidya.
Description:	1 online resource (358 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
Contained By:	Dissertations Abstracts International85-03B.
Subject:	Nanomaterials. -
Online resource:	click for full text (PQDT)
ISBN:	9798380267120

Nano-Engineering of Atomically Thin Novel 2D Materials and their Heterostructures.
Rahman, Sharidya.

Nano-Engineering of Atomically Thin Novel 2D Materials and their Heterostructures. - 1 online resource (358 pages)

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

Thesis (Ph.D.)--The Australian National University (Australia), 2023.

Includes bibliographical references

Two dimensional layered material has attracted profound interest from material science and nanotechnology community, due to its marvellous optical, electrical and magnetic properties. Due to the weak interlayer van der Waals (vdW) interactions, they can be easily thinned down to atomic thickness. Reduced physical dimensions therefore makes them an ideal and robust platform to examine fundamental material properties and light matter interactions. In addition to Transition metal dichalcogenides (TMDs), several new ferroelectric, ferromagnetic (FM), antiferromagnetic (AFM) and multiferroic layered compounds has been discovered recently, that have found potential applications from optoelectronics, microscopy, ultrashort laser pulses, optical switches, LEDs and photovoltaics to spintronics, computing and even medical sectors. Such advancement has been strongly influenced by novel physical phenomena and intriguing light matter coupling in these layered materials. This thesis primarily focusses on nano-engineering and nano-manufacturing of novel and emerging 2D materials using strain application and structural modulation, applied meticulously via nano wrinkles and moire heterostructures. This results in enhanced non-linear light matter interactions and magnetic properties in addition to novel phonon dynamics. Then the dissertation focuses on using advanced nitrogen vacancy (NV) magnetometer to characterize 2D magnets, followed by analysis of light matter interaction in novel hybrid heterostructures involving magnetic and traditional TMDs to further engineer optical properties.Effect of strain on light matter interactions are at first investigated through second harmonic generation (SHG). Strain induced wrinkles, manifested in novel ferroelectric compound (CuInP2S6; CIPS) revealed extraordinary augmentation in non-linear photon emission which is dwindled in the flat layer and mitigates its potential application in nonlinear optics. Giant SHG in strained nanostructures is further scrutinized using wavelength dependant SHG and polarization SHG to comprehensively understand the structural changes and underlying physics. This effort adds CuInP2S6among the branch of demanding nonlinear optics with potential applications in frequency conversion and optical parametric oscillators.Strain induced wrinkles and topological structures are mostly employed as crucial form of nano-engineering in emerging 2D layered materials, where strain could be controlled meticulously. Improved magnetic properties in strained FM material (Cr2Ge2Te6; CGT) are then explored through magnetic force microscopy (MFM) mapping to precisely image the magnetic phases. Series of temperature dependant MFM images are used to clearly identify the enhanced transition temperature, Tc. Large strain percentage is found to vehemently improve the Tc from cryogenic temperatures to room temperature, which is the first experimental demonstration of strain induced augmentation of Tcin layered magnetic compounds. Advanced computational and simulation models are further developed to clarify the observations and to support the experimental datas and theory.I also found relative twist between two TMD monolayers can profoundly modulate the phono dynamics by creating Moire supperlattice and periodic patterns due to large lattice and hetero strain. As an example, I studied WSe2/WS2heterobilayers and showed that heterostrain can lead to large displacement of phonon modes, modulated by the interlayer twist angle. Raman spectroscopy, a powerful non-evasive optical tool, is used to meticulously characterize the phonon properties.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380267120Subjects--Topical Terms:

1469258
Nanomaterials.
Index Terms--Genre/Form:

554714
Electronic books.

Nano-Engineering of Atomically Thin Novel 2D Materials and their Heterostructures.
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500 $a Advisor: Lu, Yuerui.
502 $a Thesis (Ph.D.)--The Australian National University (Australia), 2023.
504 $a Includes bibliographical references
520 $a Two dimensional layered material has attracted profound interest from material science and nanotechnology community, due to its marvellous optical, electrical and magnetic properties. Due to the weak interlayer van der Waals (vdW) interactions, they can be easily thinned down to atomic thickness. Reduced physical dimensions therefore makes them an ideal and robust platform to examine fundamental material properties and light matter interactions. In addition to Transition metal dichalcogenides (TMDs), several new ferroelectric, ferromagnetic (FM), antiferromagnetic (AFM) and multiferroic layered compounds has been discovered recently, that have found potential applications from optoelectronics, microscopy, ultrashort laser pulses, optical switches, LEDs and photovoltaics to spintronics, computing and even medical sectors. Such advancement has been strongly influenced by novel physical phenomena and intriguing light matter coupling in these layered materials. This thesis primarily focusses on nano-engineering and nano-manufacturing of novel and emerging 2D materials using strain application and structural modulation, applied meticulously via nano wrinkles and moire heterostructures. This results in enhanced non-linear light matter interactions and magnetic properties in addition to novel phonon dynamics. Then the dissertation focuses on using advanced nitrogen vacancy (NV) magnetometer to characterize 2D magnets, followed by analysis of light matter interaction in novel hybrid heterostructures involving magnetic and traditional TMDs to further engineer optical properties.Effect of strain on light matter interactions are at first investigated through second harmonic generation (SHG). Strain induced wrinkles, manifested in novel ferroelectric compound (CuInP2S6; CIPS) revealed extraordinary augmentation in non-linear photon emission which is dwindled in the flat layer and mitigates its potential application in nonlinear optics. Giant SHG in strained nanostructures is further scrutinized using wavelength dependant SHG and polarization SHG to comprehensively understand the structural changes and underlying physics. This effort adds CuInP2S6among the branch of demanding nonlinear optics with potential applications in frequency conversion and optical parametric oscillators.Strain induced wrinkles and topological structures are mostly employed as crucial form of nano-engineering in emerging 2D layered materials, where strain could be controlled meticulously. Improved magnetic properties in strained FM material (Cr2Ge2Te6; CGT) are then explored through magnetic force microscopy (MFM) mapping to precisely image the magnetic phases. Series of temperature dependant MFM images are used to clearly identify the enhanced transition temperature, Tc. Large strain percentage is found to vehemently improve the Tc from cryogenic temperatures to room temperature, which is the first experimental demonstration of strain induced augmentation of Tcin layered magnetic compounds. Advanced computational and simulation models are further developed to clarify the observations and to support the experimental datas and theory.I also found relative twist between two TMD monolayers can profoundly modulate the phono dynamics by creating Moire supperlattice and periodic patterns due to large lattice and hetero strain. As an example, I studied WSe2/WS2heterobilayers and showed that heterostrain can lead to large displacement of phonon modes, modulated by the interlayer twist angle. Raman spectroscopy, a powerful non-evasive optical tool, is used to meticulously characterize the phonon properties.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
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