Time-resolved XAS of Fe/MgO heterostructure

Tun Sheng Tan; Joshua Kas; Fernando Vila; John Rehr; Markus Gruner; Andrea Eschenlohr; Uwe Bovensiepen; Carolin Schmitz-Antoniak; Katharina Ollefs; Klaus Sokolowski-Tinten; Nico Rothenbach; Rossitza Pentcheva; Heiko Wende

Time-resolved XAS of Fe/MgO heterostructure

ORAL

Abstract

A recent study of energy transfer due to laser excitation in a Fe/MgO heterostructure showed that the dynamic behavior is dominated by phonon-mediated processes [1]. We present an analysis of the spectral changes in the transient x-ray absorption spectra (XAS) using a finite-temperature real-space Green’s function approach. We approximate the phonon contribution via a harmonic dynamical matrix sampling method. Our theory accounts for the spectral differences shortly after laser excitation and at long times.

March 19, 2021, 2:30 PM – March 19, 2021, 2:42 PM

Presenters

Tun Sheng Tan

University of Washington

Authors

Tun Sheng Tan

University of Washington
Joshua Kas

University of Washington
Fernando Vila

University of Washington
John Rehr

University of Washington
Markus Gruner

Faculty of Physics, University of Duisburg-Essen, University of Duisburg-Essen
Andrea Eschenlohr

University of Duisburg-Essen
Uwe Bovensiepen

University of Duisburg-Essen
Carolin Schmitz-Antoniak

Jülich Research Center
Katharina Ollefs

University of Duisburg-Essen
Klaus Sokolowski-Tinten

University of Duisburg-Essen
Nico Rothenbach

University of Duisburg-Essen
Rossitza Pentcheva

University of Duisburg-Essen, Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany, Faculty of Physics, University of Duisburg-Essen
Heiko Wende

University of Duisburg-Essen