197 citations · 558 across the 15 of their papers we have counts for
15 papers
High-sensitivity extreme-ultraviolet transient absorption spectroscopy enabled by machine learning
Tobias Heinrich, Hung-Tzu Chang, Sergey Zayko +2
We introduce a machine-learning-based approach to enhance the sensitivity of optical-extreme ultraviolet (XUV) transient absorption spectroscopy. A reference spectrum is used as in…
Electronic and structural fingerprints of charge density wave excitations in extreme ultraviolet transient absorption spectroscopy
Tobias Heinrich, Hung-Tzu Chang, Sergey Zayko +3
Femtosecond core-level transient absorption spectroscopy is utilized to investigate photoinduced dynamics of the charge density wave in 1T-TiSe2 at the Ti M2,3 edge (30-50 eV). Pho…
Carrier and Phonon Dynamics in Multilayer WSe2 captured by Extreme Ultraviolet Transient Absorption Spectroscopy
Juwon Oh, Hung-Tzu Chang, Christopher T. Chen +3
Carrier and phonon dynamics in a multilayer WSe2 film are captured by extreme ultraviolet (XUV) transient absorption (TA) spectroscopy at the W N6,7, W O2,3, and Se M4,5 edges (30-…
Characterization of Carrier Cooling Bottleneck in Silicon Nanoparticles by Extreme Ultraviolet (XUV) Transient Absorption Spectroscopy
Ilana J. Porter, Angela Lee, Scott K. Cushing +4
Silicon nanoparticles have the promise to surpass the theoretical efficiency limit of single-junction silicon photovoltaics by the creation of a "phonon bottleneck", a theorized sl…
Solid-state core-exciton dynamics in NaCl observed by tabletop attosecond four-wave mixing spectroscopy
James D Gaynor, Ashley P Fidler, Yen-Cheng Lin +4
Nonlinear wave-mixing in solids with ultrafast x-rays can provide new insight into complex electronic dynamics of materials. Here, tabletop-based attosecond noncollinear four-wave…
Coupled Valence Carrier and Core-Exciton Dynamics in WS Probed by Few-Femtosecond Extreme Ultraviolet Transient Absorption Spectroscopy
Hung-Tzu Chang, Alexander Guggenmos, Christopher T. Chen +7
Few-femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy, performed with optical 500-1000 nm supercontinuum and broadband XUV pulses (30-50 eV), simultaneously p…
Simultaneous Observation of Carrier-Specific Redistribution and Coherent Lattice Dynamics in 2H-MoTe with Femtosecond Core-Level Spectroscopy
Andrew R. Attar, Hung-Tzu Chang, Alexander Britz +12
We employ few-femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy to reveal simultaneously the intra- and interband carrier relaxation and the light-induced str…
Source noise suppression in attosecond transient absorption spectroscopy by edge-pixel referencing
Romain Géneaux, Hung-Tzu Chang, Adam M. Schwartzberg +1
Attosecond transient absorption spectroscopy (ATAS) is used to observe photoexcited dynamics with outstanding time resolution. The main experimental challenge of this technique is…
Table-top Nonlinear Extreme Ultraviolet Spectroscopy
T. Helk, E. Berger, S. Jamnuch +12
The lack of available table-top extreme ultraviolet (XUV) sources with high enough fluxes and coherence properties have limited the availability of nonlinear XUV and x-ray spectros…
Electron Thermalization and Relaxation in Laser-Heated Nickel by Few-Femtosecond Core-Level Transient Absorption Spectroscopy
Hung-Tzu Chang, Alexander Guggenmos, Scott K. Cushing +9
Direct measurements of photoexcited carrier dynamics in nickel are made using few-femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy at the nickel M ed…
Attosecond time-domain measurement of core-excitonic decay in magnesium oxide
Romain Géneaux, Christopher J. Kaplan, Lun Yue +11
Excitation of ionic solids with extreme ultraviolet pulses creates localized core-excitons, which in some cases couple strongly to the lattice. Here, core-excitonic states of magne…
Differentiating Photoexcited Carrier and Phonon Dynamics in the Δ, L, and Γ Valleys of Si(100) with Transient Extreme Ultraviolet Spectroscopy
Scott K. Cushing, Angela Lee, Ilana J. Porter +4
Transient extreme ultraviolet (XUV) spectroscopy probes core level transitions to unoccupied valence and conduction band states. Uncertainty remains to what degree the core-hole cr…
Photoexcited Small Polaron Formation in Goethite (α-FeOOH) Nanorods Probed by Transient Extreme Ultraviolet Spectroscopy
Ilana J. Porter, Scott K. Cushing, Lucas M. Carneiro +6
Small polaron formation limits the mobility and lifetimes of photoexcited carriers in metal oxides. As the ligand field strength increases, the carrier mobility decreases, but the…
Hot Phonon and Carrier Relaxation in Si(100) Determined by Transient Extreme Ultraviolet Spectroscopy
Scott K. Cushing, Michael Zürch, Peter M. Kraus +5
The thermalization of hot carriers and phonons gives direct insight into the scattering processes that mediate electrical and thermal transport. Obtaining the scattering rates for…
Direct and Simultaneous Observation of Ultrafast Electron and Hole Dynamics in Germanium
Michael Zürch, Hung-Tzu Chang, Lauren J. Borja +10
Understanding excited carrier dynamics in semiconductors is crucial for the development of photovoltaics and efficient photonic devices. However, overlapping spectral features in o…