Alexander H. Reid
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View article: Thermodynamic phase transitions of nematic order in magnetic helices
Thermodynamic phase transitions of nematic order in magnetic helices Open
A nematic phase lacks translation order but has orientational order. Nematic phases have been discovered in a variety of systems, including liquid crystals, correlated materials, and superconductors. Here, we report on a magnetic nematic p…
View article: Electrochemical Control of the Ultrafast Lattice Response of a Layered Semimetal
Electrochemical Control of the Ultrafast Lattice Response of a Layered Semimetal Open
The unique layer‐stacking in two‐dimensional (2D) van der Waals materials facilitates the formation of nearly degenerate phases of matter and opens novel routes for the design of low‐power, reconfigurable functional materials. Electrochemi…
View article: Ultrafast Symmetry Control in Photoexcited Quantum Dots
Ultrafast Symmetry Control in Photoexcited Quantum Dots Open
Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nev…
View article: On ultrafast x-ray scattering methods for magnetism
On ultrafast x-ray scattering methods for magnetism Open
With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become possible. As it relates to magnetism and ‘magnetic-type’ system…
View article: Element-specific ultrafast lattice dynamics in FePt nanoparticles
Element-specific ultrafast lattice dynamics in FePt nanoparticles Open
Light–matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is…
View article: Response of fs-Laser-Irradiated Diamond by Ultrafast Electron Diffraction
Response of fs-Laser-Irradiated Diamond by Ultrafast Electron Diffraction Open
Structural details of the proposed solid–liquid phase transition of carbon have remained elusive, despite years of study. While it is theorized that novel carbon materials form from a liquid precursor, experimental studies have lacked the …
View article: UV-Induced Reaction Pathways in Bromoform Probed with Ultrafast Electron Diffraction
UV-Induced Reaction Pathways in Bromoform Probed with Ultrafast Electron Diffraction Open
For many chemical reactions, it remains notoriously difficult to predict and experimentally determine the rates and branching ratios between different reaction channels. This is particularly the case for reactions involving short-lived int…
View article: Ultrafast symmetry control in photoexcited quantum dots
Ultrafast symmetry control in photoexcited quantum dots Open
Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nev…
View article: Multi-objective Bayesian active learning for MeV-ultrafast electron diffraction
Multi-objective Bayesian active learning for MeV-ultrafast electron diffraction Open
Ultrafast electron diffraction using MeV energy beams(MeV-UED) has enabled unprecedented scientific opportunities in the study of ultrafast structural dynamics in a variety of gas, liquid and solid state systems. Broad scientific applicati…
View article: Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La <sub>1.65</sub> Eu <sub>0.2</sub> Sr <sub>0.15</sub> CuO <sub>4</sub>
Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La <sub>1.65</sub> Eu <sub>0.2</sub> Sr <sub>0.15</sub> CuO <sub>4</sub> Open
Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump–probe time-resolved resonant X-ray scattering on the (0 0 …
View article: Nematicity of a Magnetic Helix
Nematicity of a Magnetic Helix Open
A system that possesses translational symmetry but breaks orientational symmetry is known as a nematic phase. While there are many examples of nematic phases in a wide range of contexts, such as in liquid crystals, complex oxides, and supe…
View article: Element-specific ultrafast lattice dynamics in FePt nanoparticles
Element-specific ultrafast lattice dynamics in FePt nanoparticles Open
Light-matter interaction at the nanoscale in magnetic alloys and heterostructures is a topic of intense research in view of potential applications in high-density magnetic recording. While the element-specific dynamics of electron spins is…
View article: Direct observation of strong momentum-dependent electron-phonon coupling in a metal
Direct observation of strong momentum-dependent electron-phonon coupling in a metal Open
Phonon scattering in metals is one of the most fundamental processes in materials science. However, understanding such processes has remained challenging and requires detailed information on interactions between phonons and electrons. We u…
View article: Monitoring the Evolution of Relative Product Populations at Early Times during a Photochemical Reaction
Monitoring the Evolution of Relative Product Populations at Early Times during a Photochemical Reaction Open
Identifying multiple rival reaction products and transient species formed during ultrafast photochemical reactions and determining their time-evolving relative populations are key steps toward understanding and predicting photochemical out…
View article: Monitoring the evolution of relative product populations at early times during a photochemical reaction
Monitoring the evolution of relative product populations at early times during a photochemical reaction Open
Identifying multiple rival reaction products and transient species formed during ultrafast photochemical reactions and determining their time-evolving relative populations are key steps towards understanding and predicting photochemical ou…
View article: Coupling to octahedral tilts in halide perovskite nanocrystals induces phonon-mediated attractive interactions between excitons
Coupling to octahedral tilts in halide perovskite nanocrystals induces phonon-mediated attractive interactions between excitons Open
View article: Spin-mediated shear oscillators in a van der Waals antiferromagnet
Spin-mediated shear oscillators in a van der Waals antiferromagnet Open
View article: Emergent super-antiferromagnetic correlations in monolayers of Fe3O4 nanoparticles throughout the superparamagnetic blocking transition
Emergent super-antiferromagnetic correlations in monolayers of Fe3O4 nanoparticles throughout the superparamagnetic blocking transition Open
We report nanoscale inter-particle magnetic orderings in self-assemblies of Fe3O4 nanoparticles (NPs), and the emergence of inter-particle antiferromagnetic (AF) (super-antiferromagnetic) correlations near the coercive field at low tempera…
View article: Verwey transition as evolution from electronic nematicity to trimerons via electron-phonon coupling
Verwey transition as evolution from electronic nematicity to trimerons via electron-phonon coupling Open
Understanding the driving mechanisms behind metal-insulator transitions (MITs) is a critical step toward controlling material’s properties. Since the proposal of charge order–induced MIT in magnetite Fe 3 O 4 in 1939 by Verwey, the nature …
View article: On Ultrafast X-ray Methods for Magnetism
On Ultrafast X-ray Methods for Magnetism Open
With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become possible. As it relates to magnetism and "magnetic-type" system…
View article: Understanding and Controlling Photothermal Responses in MXenes
Understanding and Controlling Photothermal Responses in MXenes Open
MXenes have the potential for efficient light-to-heat conversion in photothermal applications. To effectively utilize MXenes in such applications, it is important to understand the underlying nonequilibrium processes, including electron-ph…
View article: Ultrafast Optomechanical Strain in Layered GeS
Ultrafast Optomechanical Strain in Layered GeS Open
Strong coupling between light and mechanical strain forms the foundation for next-generation optical micro- and nano-electromechanical systems. Such optomechanical responses in two-dimensional materials present novel types of functionaliti…
View article: Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains
Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains Open
Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, u…
View article: Bidirectional phonon emission in two-dimensional heterostructures triggered by ultrafast charge transfer
Bidirectional phonon emission in two-dimensional heterostructures triggered by ultrafast charge transfer Open
View article: Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric
Light-Driven Ultrafast Polarization Manipulation in a Relaxor Ferroelectric Open
Relaxor ferroelectrics have been intensely studied for decades based on their unique electromechanical responses which arise from local structural heterogeneity involving polar nanoregions or domains. Here, we report first studies of the u…
View article: Dual-stage structural response to quenching charge order in magnetite
Dual-stage structural response to quenching charge order in magnetite Open
The Verwey transition in magnetite (Fe3O4) is the prototypical metal-insulator transition and has eluded a comprehensive explanation for decades. A major element of the challenge is the complex interplay between charg…
View article: Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer
Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer Open
Ultrafast optical pumping of spatially nonuniform magnetic textures is known to induce far-from-equilibrium spin transport effects. Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynami…
View article: Large Exchange Coupling Between Localized Spins and Topological Bands in MnBi<sub>2</sub>Te<sub>4</sub>
Large Exchange Coupling Between Localized Spins and Topological Bands in MnBi<sub>2</sub>Te<sub>4</sub> Open
Magnetism in topological materials creates phases exhibiting quantized transport phenomena with potential technological applications. The emergence of such phases relies on strong interaction between localized spins and the topological ban…
View article: Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$
Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$ Open
Understanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant x-ray scattering on the (0 0 …
View article: The fluctuation–dissipation measurement instrument at the Linac Coherent Light Source
The fluctuation–dissipation measurement instrument at the Linac Coherent Light Source Open
The development of new modes at x-ray free electron lasers has inspired novel methods for studying fluctuations at different energies and timescales. For closely spaced x-ray pulses that can be varied on ultrafast time scales, we have cons…