Towards the Optical Control of Resonantly Bonded Materials: An Ultrafast X-Ray Study

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Yijing Huang

Towards the Optical Control of Resonantly Bonded Materials

An Ultrafast X-Ray Study

Yijing Huang

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English

Springer International Publishing AG
23 January 2024

Condensed matter physics (liquid state & solid state physics); Spectrum analysis, spectrochemistry, mass spectrometry; Testing of materials

Series: Springer Theses

This thesis describes key contributions to the fundamental understanding of materials structure and dynamics from a microscopic perspective. In particular, the thesis reports several advancements in time-domain methodologies using ultrafast pulses from X-ray free-electron lasers (FEL) to probe the interactions between electrons and phonons in photoexcited materials. Using femtosecond time-resolved X-ray diffraction, the author quantifies the coherent atomic motion trajectory upon sudden excitation of carriers in SnSe. This allows the reconstruction of the nonequilibrium lattice structure and identification of a novel lattice instability towards a higher-symmetry structure not found in equilibrium. This is followed by an investigation of the excited-state phonon dispersion in SnSe using time-resolved X-ray diffuse scattering which enables important insight into how photoexcitation alters the strength of specific bonds leading to the novel lattice instability observed in X-ray diffraction. Finally, by combining ultrafast X-ray diffraction and ARPES, the author performs quantitative measurements of electron-phonon coupling in Bi2Te3 and Bi2Se3. The findings highlight the importance of time-resolved X-ray scattering techniques based on FELs, which reveals the details of interplay between electron orbitals, atomic bonds, and structural instabilities. The microscopic information of electron phonon interaction obtained from these methods can rationalize ways to control materials and to design their functional properties.

By: Yijing Huang
Imprint: Springer International Publishing AG
Country of Publication: Switzerland
Edition: 2023 ed.
Dimensions: Height: 235mm, Width: 155mm,
Weight: 430g
ISBN: 9783031428258
ISBN 10: 3031428250
Series: Springer Theses
Pages: 159
Publication Date: 23 January 2024
Audience: Professional and scholarly , Undergraduate
Format: Hardback
Publisher's Status: Active

Chapter 1: Ultrafast X-ray Scattering and Nonequilibrium States of Matter.- Chapter 2: Lattice Dynamics: Excitation and Probe.- Chapter 3: Resonantly Bonded Semiconductors.- Chapter 4: Ultrafast Lasers and X-ray Pump Probe Experiment.- Chapter 5: Photoinduced Novel Lattice Instability in SnSe.

Yijing Huang earned her Bachelor's degree in Physics from Tsinghua University in 2016. She completed her PhD in the year 2022 in the Applied Physics program at Stanford University. Her primary research interests revolve around the field of light-matter interaction, with a specific focus on ultrafast X-ray scattering and the study of nonequilibrium states of matter for her thesis. Currently, she is an IQUIST (Illinois Quantum Information Science and Technology) fellow at the University of Illinois, within the Department of Physics. Dr. Huang's thesis work was recognized when she was awarded the 2022 LCLS (Linac Coherent Light Source) Young Investigator Award. She was also selected as one of the finalists for the Carl E. Anderson Division of Laser Science Dissertation Award. As of the time of this publication, Yijing Huang remains actively involved in research in the field of light-matter interaction and its applications.