Unmasking the cis-Stilbene Phantom State via Vacuum Ultraviolet Time-Resolved Photoelectron Spectroscopy and Ab Initio Multiple Spawning

2021 ◽  
pp. 6363-6369
Author(s):  
Monika Williams ◽  
Ruaridh Forbes ◽  
Hayley Weir ◽  
Kévin Veyrinas ◽  
Ryan J. MacDonell ◽  
...  
Keyword(s):  
Ab Initio ◽  
Photoelectron Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Time Resolved ◽  
Multiple Spawning

scholarly journals Hexamethylcyclopentadiene: time-resolved photoelectron spectroscopy and ab initio multiple spawning simulations

2014 ◽  
Vol 16 (23) ◽  
pp. 11770-11779 ◽  
Author(s):  
T. J. A. Wolf ◽  
T. S. Kuhlman ◽  
O. Schalk ◽  
T. J. Martínez ◽  
K. B. Møller ◽  
...  
Keyword(s):  
Ab Initio ◽  
Photoelectron Spectroscopy ◽  
Degree Of Freedom ◽  
Time Resolved ◽  
Multiple Spawning ◽  
Dynamical Simulations

Time-resolved photoelectron spectroscopy and ab initio multiple spawning dynamical simulations of hexamethylcyclopentadiene reveal wavepacket evolution in a distinct degree of freedom.

scholarly journals Subpicosecond metamagnetic phase transition driven by non-equilibrium electron dynamics

2021 ◽  
Author(s):  
Federico Pressacco ◽  
Davide Sangalli ◽  
Vojtěch Uhlíř ◽  
Dmytro Kutnyakhov ◽  
Jon Ander Arregi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Ab Initio ◽  
Photoelectron Spectroscopy ◽  
Electronic Band Structure ◽  
Ferromagnetic Phase ◽  
Electron Dynamics ◽  
Electronic Band ◽  
Time Resolved ◽  
Non Equilibrium

Abstract Femtosecond light-induced phase transitions between different macroscopic orders provide the possibility to tune the functional properties of condensed matter on ultrafast timescales. In first-order phase transitions, transient non-equilibrium phases and inherent phase coexistence often preclude non-ambiguous detection of transition precursors and their temporal onset. Here, we present a study combining time-resolved photoelectron spectroscopy and ab-initio electron dynamics calculations elucidating the transient subpicosecond processes governing the photoinduced generation of ferromagnetic order in antiferromagnetic FeRh. The transient photoemission spectra are accounted for by assuming that not only the occupation of electronic states is modified during the photoexcitation process. Instead, the photo-generated non-thermal distribution of electrons modifies the electronic band structure. The ferromagnetic phase of FeRh, characterized by a minority band near the Fermi energy, is established 350 ± 30 fs after the laser excitation. Ab-initio calculations indicate that the phase transition is initiated by a photoinduced Rh-to-Fe charge transfer.

scholarly journals Subpicosecond metamagnetic phase transition in FeRh driven by non-equilibrium electron dynamics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Federico Pressacco ◽  
Davide Sangalli ◽  
Vojtěch Uhlíř ◽  
Dmytro Kutnyakhov ◽  
Jon Ander Arregi ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Ab Initio ◽  
Photoelectron Spectroscopy ◽  
Electronic Band Structure ◽  
Ferromagnetic Phase ◽  
Electron Dynamics ◽  
Electronic Band ◽  
Time Resolved ◽  
Non Equilibrium

AbstractFemtosecond light-induced phase transitions between different macroscopic orders provide the possibility to tune the functional properties of condensed matter on ultrafast timescales. In first-order phase transitions, transient non-equilibrium phases and inherent phase coexistence often preclude non-ambiguous detection of transition precursors and their temporal onset. Here, we present a study combining time-resolved photoelectron spectroscopy and ab-initio electron dynamics calculations elucidating the transient subpicosecond processes governing the photoinduced generation of ferromagnetic order in antiferromagnetic FeRh. The transient photoemission spectra are accounted for by assuming that not only the occupation of electronic states is modified during the photoexcitation process. Instead, the photo-generated non-thermal distribution of electrons modifies the electronic band structure. The ferromagnetic phase of FeRh, characterized by a minority band near the Fermi energy, is established 350 ± 30 fs after the laser excitation. Ab-initio calculations indicate that the phase transition is initiated by a photoinduced Rh-to-Fe charge transfer.

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