Speaker
Mr
Martin Kubli
(Institute for Quantum Electronics, ETH Zürich)
Description
Sn2P2Se6 is a ferroelectric semiconductor with interesting structural properties. In the temperature range between 193 and 221 K, just above the Curie-Temperature, an incommensurate phase emerges. This permanent structural modulation is believed to be the result of two coupled frozen phonon modes.
In our experiment, we photoexcite the material and probe this structural modulation using ultrafast time-resolved x-ray diffraction and observe the dynamics of the two coupled modes across the phase transition. We found that the electronic excitation only couples indirectly via other phonon modes to these two coupled modes.
Authors
Mr
Martin Kubli
(Institute for Quantum Electronics, ETH Zürich)
Dr
Matteo Savoini
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Mr
Vincent Esposito
(Swiss Light Source, Paul Scherrer Institut)
Mr
Lucas Huber
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Elisabeth Bothschafter
(Paul Scherrer Institut)
Dr
Sergii Parchenko
(Paul Scherrer Institut)
Gabriel Lantz
(ETH Zürich)
Dr
Elsa Abreu
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
Dr
Jochen Rittmann
(Swiss Light Source, Paul Scherrer Institut)
Makina Yabashi
(RIKEN)
Yoshikazu Tanaka
(RIKEN SPring8 Center)
Tetsuo Katayama
(RIKEN SPring-8 Center)
Tadashi Togashi
(RIKEN SPring-8 Center)
Prof.
Steven Lee Johnson
(Institute for Quantum Electronics, Physics Department, ETH Zürich)
