학술논문
Hard X-ray Transient Grating Spectroscopy on Bismuth Germanate
Document Type
Working Paper
Author
Rouxel, Jeremy R.; Fainozzi, Danny; Mankowsky, Roman; Rosner, Benedikt; Seniutinas, Gediminas; Mincigrucci, Riccardo; Catalini, Sara; Foglia, Laura; Cucini, Riccardo; Doring, Florian; Kubec, Adam; Koch, Frieder; Bencivenga, Filippo; Haddad, Andre Al; Gessini, Alessandro; Maznev, Alexei A.; Cirelli, Claudio; Gerber, Simon; Pedrini, Bill; Mancini, Giulia F.; Razzoli, Elia; Burian, Max; Ueda, Hiroki; Pamfilidis, Georgios; Ferrari, Eugenio; Deng, Yunpei; Mozzanica, Aldo; Johnson, Philip J. M.; Ozerov, Dmitry; Izzo, Maria G.; Bottari, Cettina; Arrell, Christopher; Divall, Edwin J.; Zerdane, Serhane; Sander, Mathias; Knopp, Gregor; Beaud, Paul; Lemke, Henrik T.; Milne, Chris J.; David, Christian; Torre, Renato; Chergui, Majed; Nelson, Keith A.; Masciovecchio, Claudio; Staub, Urs; Patthey, Luc; Svetina, Cristian
Source
Subject
Language
Abstract
Optical-domain Transient Grating (TG) spectroscopy is a versatile background-free four-wave-mixing technique used to probe vibrational, magnetic and electronic degrees of freedom in the time domain. The newly developed coherent X-ray Free Electron Laser sources allow its extension to the X-ray regime. Xrays offer multiple advantages for TG: their large penetration depth allows probing the bulk properties of materials, their element-specificity can address core-excited states, and their short wavelengths create excitation gratings with unprecedented momentum transfer and spatial resolution. We demonstrate for the first time TG excitation in the hard X-ray range at 7.1 keV. In Bismuth Germanate (BGO), the nonresonant TG excitation generates coherent optical phonons detected as a function of time by diffraction of an optical probe pulse. This experiment demonstrates the ability to probe bulk properties of materials and paves the way for ultrafast coherent four-wave-mixing techniques using X-ray probes and involving nanoscale TG spatial periods.
Comment: 11 pages, 4 figures
Comment: 11 pages, 4 figures