Details

Autor(en) / Beteiligte

• Zhu, Linghua
• Seman, Tsezar F.
• van Veenendaal, Michel
• Ahn, Keun Hyuk

Titel

Photoinduced nonequilibrium dynamics in charge ordered materials

Ist Teil von

• Journal of applied physics, 2018-03, Vol.123 (11)

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2018

Link zum Volltext

Quelle

AIP Journals (American Institute of Physics)

Beschreibungen/Notizen

• We study the nonequilibrium dynamics of photoinduced phase transitions in charge ordered (CO) systems with a strong electron-lattice interaction and analyze the interplay between electrons, periodic lattice distortions, and a phonon thermal reservoir. Simulations based on a tight-binding Hamiltonian and Boltzmann equations reveal partially decoupled oscillations of the electronic order parameter and the periodic lattice distortion during CO melting, which becomes more energy efficient with lower photon energy. The cooling rate of the electron system correlates with the CO gap dynamics, responsible for an order of magnitude decrease in the cooling rate upon the gap reopening. We also find that the time-dependent frequency of coherent oscillation reflects the dynamics of the energy landscape, such as transition between single-well and double-well, which sensitively depends on the photon energy and the pump fluence. The results demonstrate the intricate nonequilibrium dynamics in CO materials.