Speaker
Mr
Martin Josef Neugebauer
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Description
We used ultrashort x-ray pulses to monitor the structural dynamics associated with the charge density wave (CDW)-state in K0.3MoO3 after photoexcitation. In a first experiment the response to different excitation fluences was investigated. Starting in a regime of coherent oscillations, increasing the excitation fluence leads to a complete melting of the ordered state. Remarkably, a further increase in fluence results in a short recovery of the CDW on a sub-picosecond time scale. In follow-up measurements, we could create a second recovery by applying another photoexcitation to the first one. An understanding of the microscopic mechanisms of this recovery may enhance our theoretical understanding of ultrafast CDW transitions in general.
Author
Mr
Martin Josef Neugebauer
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Co-authors
Dr
Tim Huber
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Matteo Savoini
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Sebastian Grübel
(Swiss Light Source, Paul Scherrer Institut)
Mr
Lucas Huber
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Teresa Kubacka
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Mr
Christian Dornes
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Elsa Abreu
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Mr
Martin Kubli
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Elisabeth Bothschafter
(Swiss Light Source, Paul Scherrer Institut)
Dr
Laurenz Rettig
(Swiss Light Source, Paul Scherrer Institut)
Dr
Jochen Rittmann
(Swiss Light Source, Paul Scherrer Institut)
Mr
Vincent Esposito
(Swiss Light Source, Paul Scherrer Institut)
Dr
Paul Beaud
(Swiss Light Source, Paul Scherrer Institut)
Dr
Gerhard Ingold
(Swiss Light Source, Paul Scherrer Institut)
Prof.
Jure Demsar
(Physics Department, Universität Konstanz)
Prof.
Steven Lee Johnson
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
