211 citations · 984 across the 18 of their papers we have counts for
18 papers
Electronic Signature of Melting Onset in Polycrystalline Copper at Extreme Conditions
Edna R. Toro, Tobias Held, Armin Bergermann +8
Ultrafast melting is fundamentally a structural transition of the ionic lattice, but this rearrangement also reshapes the electronic properties by changing the energy landscape and…
Probing the atomic dynamics of ultrafast melting with femtosecond electron diffraction
M. Z. Mo, M. B. Maigler, T. Held +12
Melting is an everyday phase transition that is determined by thermodynamic parameters like temperature and pressure. In contrast, ultrafast melting is governed by the microscopic…
Roadmap for warm dense matter physics
Jan Vorberger, Frank Graziani, David Riley +71
This roadmap presents the state-of-the-art, current challenges and near future developments anticipated in the thriving field of warm dense matter physics. Originating from strongl…
Speed of sound in methane under conditions of planetary interiors
Thomas G. White, Hannah Poole, Emma E. McBride +32
We present direct observations of acoustic waves in warm dense matter. We analyze wave-number- and energy-resolved x-ray spectra taken from warm dense methane created by laser heat…
Dynamics of a Persistent Insulator-to-Metal Transition in Strained Manganite Films
Samuel W. Teitelbaum, Benjamin K. Ofori-Okai, Yu-Hsiang Cheng +5
Transition metal oxides possess complex free energy surfaces with competing degrees of freedom. Photoexcitation allows shaping of such rich energy landscapes. In epitaxially strain…
Femtosecond compression dynamics and timing jitter suppression in a terahertz-driven electron bunch compressor
E. C. Snively, M. A. K. Othman, M. Kozina +8
We present the first demonstration of THz-driven bunch compression and timing stabilization of a few-fC relativistic electron beam with kinetic energy of 2.5 MeV using quasi-single…
Dynamical slowing down in an ultrafast photo-induced phase transition
Alfred Zong, Pavel E. Dolgirev, Anshul Kogar +20
Complex systems, which consist of a large number of interacting constituents, often exhibit universal behavior near a phase transition. A slowdown of certain dynamical observables…
Terahertz generation by beamlet superposition
Koustuban Ravi, Benjamin Ofori-Okai, Keith A. Nelson +1
We analytically show how a superposition of beamlets produces terahertz radiation with greater spatial homogeneity and efficiency compared to tilted-pulse-fronts generated by diffr…
Setup for meV-resolution inelastic X-ray scattering measurements at the Matter in Extreme Conditions Endstation at the LCLS
E. E. McBride, T. G. White, A. Descamps +24
We describe a setup for performing inelastic X-ray scattering measurements at the Matter in Extreme Conditions (MEC) endstation of the Linac Coherent Light Source (LCLS). This tech…
Terahertz-based attosecond metrology of relativistic electron beams
R. K. Li, M. C. Hoffmann, E. A. Nanni +9
Photons, electrons, and their interplay are at the heart of photonic devices and modern instruments for ultrafast science [1-10]. Nowadays, electron beams of the highest intensity…
Development of Single-Shot Multi-Frame Imaging of Cylindrical Shock Waves in a Multi-Layered Assembly
Leora Dresselhaus-Cooper, Joshua E. Gorfain, Chris T. Key +6
We demonstrate single-shot multi-frame imaging of quasi-2D cylindrically converging shock waves as they propagate through a multi-layer target sample assembly. We visualize the sho…
Rapid and Precise Determination of Zero-Field Splittings by Terahertz Time-Domain Electron Paramagnetic Resonance Spectroscopy
Jian Lu, I. Ozge Ozel, Carina Belvin +7
Zero-field splitting (ZFS) parameters are fundamentally tied to the geometries of metal ion complexes. Despite their critical importance for understanding the magnetism and spectro…
Two-dimensional terahertz magnetic resonance spectroscopy of collective spin waves
Jian Lu, Xian Li, Harold Y. Hwang +4
Nonlinear manipulation of nuclear and electron spins is the basis for all advanced methods in magnetic resonance including multidimensional nuclear magnetic and electron spin reson…
Nonlinear two-dimensional terahertz photon echo and rotational spectroscopy in the gas phase
Jian Lu, Yaqing Zhang, Harold Y. Hwang +3
Ultrafast two-dimensional spectroscopy utilizes correlated multiple light-matter interactions for retrieving dynamic features that may otherwise be hidden under the linear spectrum…
THz generation using a reflective stair-step echelon
Benjamin K. Ofori-Okai, Prasahnt Sivarajah, W. Ronny Huang +1
We present a novel method for THz generation in lithium niobate using a reflective stair-step echelon structure. The echelon produces a discretely tilted pulse front with less angu…
What is the Brillouin Zone of an Anisotropic Photonic Crystal?
P. Sivarajah, A. A. Maznev, B. K. Ofori-Okai +1
The concept of the Brillouin zone (BZ) in relation to a photonic crystal fabricated in an optically anisotropic material is explored both experimentally and theoretically. In exper…
Transient terahertz photoconductivity measurements of minority-carrier lifetime in tin sulfide thin films: Advanced metrology for an early-stage photovoltaic material
R. Jaramillo, Meng-Ju Sher, Benjamin K. Ofori-Okai +7
Materials research with a focus on enhancing the minority-carrier lifetime of the light-absorbing semiconductor is key to advancing solar energy technology for both early-stage and…
Spin Properties of Very Shallow Nitrogen Vacancy Defects in Diamond
B. K. Ofori-Okai, S. Pezzagna, K. Chang +7
We investigate spin and optical properties of individual nitrogen-vacancy centers located within 1-10 nm from the diamond surface. We observe stable defects with a characteristic o…