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A Real-Time Time-Dependent Density Functional Tight-Binding Implementation for Semiclassical Excited State

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We developed a new computational tool, real-time time-dependent DFTB (TD-DFTB), for simulating ultrafast quantum dynamics in molecules and nanosystems. This efficient method enables accurate studies of photoexcited systems and advanced spectroscopic analyses.

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Area of Science:

  • Computational chemistry and physics
  • Quantum dynamics simulations
  • Spectroscopy

Background:

  • Simulating ultrafast quantum dynamics in photoexcited systems requires efficient computational tools.
  • Existing methods often struggle with low computational cost and describing quantum effects accurately.

Purpose of the Study:

  • To develop an efficient real-time time-dependent DFTB (TD-DFTB) implementation for simulating subpicosecond dynamics.
  • To enable the study of nuclear motion effects in photoinduced charge transfer and enhance computational spectroscopies.

Main Methods:

  • Combining the Density Functional Tight-Binding (DFTB) method with the semiclassical Ehrenfest method.
  • Implementing a real-time TD-DFTB code with novel features for static and time-resolved spectroscopies.
  • Utilizing corrections like "LDA+U" and "pseudo SIC" for improved optical property calculations.

Main Results:

  • The TD-DFTB implementation accurately simulates nuclear motion effects in photoinduced charge transfer.
  • It handles optical properties of periodic materials and improves calculations with "LDA+U" and "pseudo SIC" corrections.
  • Efficient simulation of time-resolved transient absorption and impulsive vibrational spectra is now feasible.

Conclusions:

  • The developed TD-DFTB method provides an efficient tool for studying ultrafast quantum dynamics.
  • It opens new avenues for investigating nonequilibrium phenomena and vibrational coherences in various materials.
  • This advancement facilitates the exploration of photochemical mechanisms and material properties.