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X-Ray Photon Correlation Spectroscopy as a Probe of Non-Equilibrium Phase Dynamics in Ferroelectric Superlattices.
X-Ray Photon Correlation Spectroscopy as a Probe of Non-Equilibrium Phase Dynamics in Ferroelectric Superlattices.
상세정보
- 자료유형
- 학위논문
- Control Number
- 0017164864
- International Standard Book Number
- 9798346381341
- Dewey Decimal Classification Number
- 338.9001511
- Main Entry-Personal Name
- Mangu, Anudeep.
- Publication, Distribution, etc. (Imprint
- [S.l.] : Stanford University., 2024
- Publication, Distribution, etc. (Imprint
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- Physical Description
- 94 p.
- General Note
- Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
- General Note
- Includes supplementary digital materials.
- General Note
- Advisor: Lindenberg, Aaron.
- Dissertation Note
- Thesis (Ph.D.)--Stanford University, 2024.
- Summary, Etc.
- 요약A central paradigm of non-equilibrium physics concerns the dynamics of heterogeneity and disorder, impacting processes ranging from the behavior of glasses to the emergent functionality of active matter. Understanding these complex mesoscopic systems requires probing the microscopic trajectories associated with irreversible processes, the role of fluctuations and entropy growth, and the timescales on which non-equilibrium responses are ultimately maintained. Approaches that illuminate these processes in model systems may enable a more general understanding of other heterogeneous non-equilibrium phenomena, and potentially define ultimate speed and energy cost limits for information processing technologies. The high brilliance, high degree of coherence, and short pulse duration of X-ray free electron lasers (XFELs) open new possibilities for probing these heterogenous materials dynamics at the angstrom, nanometer, and mesoscopic length scale and femtosecond to microsecond time scale. In this work, we describe new efforts to use pump-probe X-ray diffraction (XRD) and X-ray photon correlation spectroscopy (XPCS) to visualize the non-equilibrium and irreversible phase dynamics of materials. We analyze the phase transformation of a superlattice of PbTiO3/SrTiO3 transforming from a phase mixture of vortex and ferroelectric domains into a polar supercrystal phase using XRD and XPCS in a pump-probe, single-shot geometry. These experiments together with multiple modeling approaches uncover a non-equilibrium correlation response spanning greater than 10 orders of magnitude in timescales, with multistep behavior similar to the plateaus observed in supercooled liquids and glasses. We show that the long time dynamics can be understood in terms of with stochastic domain wall dynamics that arise during this phase transition. This experiment demonstrated a method enabled by XFELs to perform novel in situ studies of the mesoscale dynamics of systems undergoing irreversible processes. Many structural changes in materials caused by a variety of pumping mechanisms can be interrogated by this technique, enabling a new way to gather information about the mesoscale ultrafast dynamics of heterogeneous materials. Additional experiments have revealed the existence of other metastable phases in PbTiO3/SrTiO3 that have shown ultrafast changes in speckle pattern as a result of optical excitation.
- Subject Added Entry-Topical Term
- Growth models.
- Subject Added Entry-Topical Term
- Spectrum analysis.
- Subject Added Entry-Topical Term
- Vortices.
- Subject Added Entry-Topical Term
- Data processing.
- Subject Added Entry-Topical Term
- Phase transitions.
- Subject Added Entry-Topical Term
- Correlation analysis.
- Subject Added Entry-Topical Term
- Satellites.
- Subject Added Entry-Topical Term
- Visualization.
- Subject Added Entry-Topical Term
- X-rays.
- Subject Added Entry-Topical Term
- Aerospace engineering.
- Subject Added Entry-Topical Term
- Analytical chemistry.
- Subject Added Entry-Topical Term
- Optics.
- Added Entry-Corporate Name
- Stanford University.
- Host Item Entry
- Dissertations Abstracts International. 86-05B.
- Electronic Location and Access
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:656194
MARC
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a338.9001511
■1001 ▼aMangu, Anudeep.
■24510▼aX-Ray Photon Correlation Spectroscopy as a Probe of Non-Equilibrium Phase Dynamics in Ferroelectric Superlattices.
■260 ▼a[S.l.]▼bStanford University. ▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a94 p.
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-05, Section: B.
■500 ▼aIncludes supplementary digital materials.
■500 ▼aAdvisor: Lindenberg, Aaron.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2024.
■520 ▼aA central paradigm of non-equilibrium physics concerns the dynamics of heterogeneity and disorder, impacting processes ranging from the behavior of glasses to the emergent functionality of active matter. Understanding these complex mesoscopic systems requires probing the microscopic trajectories associated with irreversible processes, the role of fluctuations and entropy growth, and the timescales on which non-equilibrium responses are ultimately maintained. Approaches that illuminate these processes in model systems may enable a more general understanding of other heterogeneous non-equilibrium phenomena, and potentially define ultimate speed and energy cost limits for information processing technologies. The high brilliance, high degree of coherence, and short pulse duration of X-ray free electron lasers (XFELs) open new possibilities for probing these heterogenous materials dynamics at the angstrom, nanometer, and mesoscopic length scale and femtosecond to microsecond time scale. In this work, we describe new efforts to use pump-probe X-ray diffraction (XRD) and X-ray photon correlation spectroscopy (XPCS) to visualize the non-equilibrium and irreversible phase dynamics of materials. We analyze the phase transformation of a superlattice of PbTiO3/SrTiO3 transforming from a phase mixture of vortex and ferroelectric domains into a polar supercrystal phase using XRD and XPCS in a pump-probe, single-shot geometry. These experiments together with multiple modeling approaches uncover a non-equilibrium correlation response spanning greater than 10 orders of magnitude in timescales, with multistep behavior similar to the plateaus observed in supercooled liquids and glasses. We show that the long time dynamics can be understood in terms of with stochastic domain wall dynamics that arise during this phase transition. This experiment demonstrated a method enabled by XFELs to perform novel in situ studies of the mesoscale dynamics of systems undergoing irreversible processes. Many structural changes in materials caused by a variety of pumping mechanisms can be interrogated by this technique, enabling a new way to gather information about the mesoscale ultrafast dynamics of heterogeneous materials. Additional experiments have revealed the existence of other metastable phases in PbTiO3/SrTiO3 that have shown ultrafast changes in speckle pattern as a result of optical excitation.
■590 ▼aSchool code: 0212.
■650 4▼aGrowth models.
■650 4▼aSpectrum analysis.
■650 4▼aVortices.
■650 4▼aData processing.
■650 4▼aPhase transitions.
■650 4▼aCorrelation analysis.
■650 4▼aSatellites.
■650 4▼aVisualization.
■650 4▼aX-rays.
■650 4▼aAerospace engineering.
■650 4▼aAnalytical chemistry.
■650 4▼aOptics.
■690 ▼a0538
■690 ▼a0486
■690 ▼a0752
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g86-05B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164864▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
