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Persistent order due to transiently enhanced nesting in an electronically excited charge density wave
L Rettig1,2, R Cortés2,3, J-H Chu4,5
1Fakultät für Physik, Universität Duisburg-Essen, Lotharstr. 1, D-47057 Duisburg, Germany.
Nature Communications
|January 26, 2016
Summary
Researchers observed a transient charge density wave stabilization in a non-equilibrium state, counteracting order suppression. This highlights a dynamic interplay between electronic excited states and Fermi surface nesting.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Ultrafast Spectroscopy
Background:
- Non-equilibrium conditions can induce novel material properties not found in equilibrium.
- Excited electronic states can influence nuclear motion, but energy relaxation often disrupts ordered states.
Purpose of the Study:
- To investigate the dynamic behavior of charge density waves under non-equilibrium conditions.
- To explore the mechanisms stabilizing or destabilizing order in excited states.
Main Methods:
- Femtosecond time- and angle-resolved photoemission spectroscopy (TR-PES).
- Near-infrared optical excitation.
- Analysis of dynamic electronic structure and energy gaps.
Main Results:
- Observed transient stabilization of a charge density wave after excitation.
- Demonstrated a remaining energy gap in a highly excited transient state.
- Identified a competition between order-reducing fluctuations and order-stabilizing Fermi surface nesting.
Conclusions:
- Transient charge density wave stabilization can occur in non-equilibrium excited states.
- Fermi surface nesting plays a crucial role in stabilizing order against fluctuations.
- This provides insights into controlling material properties out of equilibrium.
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