Hard X-ray Transient Grating Spectroscopy on Bismuth Germanate
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.
Keywords
Cite
@article{arxiv.2104.01030,
title = {Hard X-ray Transient Grating Spectroscopy on Bismuth Germanate},
author = {Jeremy R. Rouxel and Danny Fainozzi and Roman Mankowsky and Benedikt Rosner and Gediminas Seniutinas and Riccardo Mincigrucci and Sara Catalini and Laura Foglia and Riccardo Cucini and Florian Doring and Adam Kubec and Frieder Koch and Filippo Bencivenga and Andre Al Haddad and Alessandro Gessini and Alexei A. Maznev and Claudio Cirelli and Simon Gerber and Bill Pedrini and Giulia F. Mancini and Elia Razzoli and Max Burian and Hiroki Ueda and Georgios Pamfilidis and Eugenio Ferrari and Yunpei Deng and Aldo Mozzanica and Philip J. M. Johnson and Dmitry Ozerov and Maria G. Izzo and Cettina Bottari and Christopher Arrell and Edwin J. Divall and Serhane Zerdane and Mathias Sander and Gregor Knopp and Paul Beaud and Henrik T. Lemke and Chris J. Milne and Christian David and Renato Torre and Majed Chergui and Keith A. Nelson and Claudio Masciovecchio and Urs Staub and Luc Patthey and Cristian Svetina},
journal= {arXiv preprint arXiv:2104.01030},
year = {2021}
}
Comments
11 pages, 4 figures