Abstract
Obtaining insight into microscopic cooperative effects is a fascinating
topic in condensed matter research because, through self-coordination
and collectivity, they can lead to instabilities with macroscopic
impacts like phase transitions. We used femtosecond time- and angle-resolved
photoelectron spectroscopy (trARPES) to optically pump and probe
TbTe3, an excellent model system with which to study these effects.
We drove a transient charge density wave melting, excited collective
vibrations in TbTe3, and observed them through their time-, frequency-,
and momentum-dependent influence on the electronic structure. We
were able to identify the role of the observed collective vibration
in the transition and to document the transition in real time. The
information that we demonstrate as being accessible with trARPES
will greatly enhance the understanding of all materials exhibiting
collective phenomena.
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