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Ultrafast structural transition and electron-phonon/phonon-phonon coupling in antimony revealed by nonadiabatic molecular dynamics. | LitMetric

Ultrafast structural transition and electron-phonon/phonon-phonon coupling in antimony revealed by nonadiabatic molecular dynamics.

J Phys Condens Matter

State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 130012 Changchun, People's Republic of China.

Published: November 2024

AI Article Synopsis

  • rt-TDDFT-MD study shows ultrafast structural transitions in antimony under varying excitation intensities leading to distinct behaviors like PD flipping within 1 picosecond.
  • As excitation intensity increases, coherent A-phonon mode activation occurs, facilitating structural motion and transforming coherent energies into random thermal motions through phonon-phonon interactions.
  • Balancing coherent and decoherent motions at moderate excitation levels results in stable nonvolatile-like PD flipping, highlighting the significant role of electron-phonon and phonon-phonon couplings in light-manipulated structural transitions.

Article Abstract

Real-time time-dependent density-functional theory molecular dynamics (rt-TDDFT-MD) reveals the nonadiabatic dynamics of the ultrafast photoinduced structural transition in a typical phase-change material antimony (Sb) with Peierls distortion (PD). As the excitation intensity increases from 3.54% to 5.00%, three distinct structural transition behaviors within 1 ps are observed: no PD flipping, nonvolatile-like PD flipping, and nonstop back-and-forward PD flipping. Analyses on electron-phonon and phonon-phonon couplings indicate that the excitation-activated coherent Aphonon mode by electron-phonon coupling drives the structural transition within several hundred femtoseconds. Then, the energy of coherent motions are transformed into that of random thermal motions via phonon-phonon coupling, which prevents the A-mode-like coherent structure oscillations. The electron-phonon coupling and coherent motions will be enhanced with increasing the excitation intensity. Therefore, a moderate excitation intensity that can balance the coherent and decoherent thermal movements will result in a nonvolatile-like PD flipping. These findings illustrate important roles of nonadiabatic electron-phonon/phonon-phonon couplings in the ultrafast laser-induced structural transitions in materials with PD, offering insights for manipulating their structures and properties by light.

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Source
http://dx.doi.org/10.1088/1361-648X/ad8696DOI Listing

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