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Related Experiment Video

Updated: Sep 18, 2025

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Published on: March 29, 2016

Basis-Discretized Surface Hopping for Auger Processes.

Xuhui Xu¹, Shriya Gumber², Oleg V Prezhdo²

¹College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, P. R. China.

Journal of Chemical Theory and Computation

|June 26, 2025

Summary

This summary is machine-generated.

We developed a new computational method for simulating excited-state dynamics in materials. This approach accurately models complex processes like Auger-type events in silicon quantum dots.

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Area of Science:

Computational Chemistry
Materials Science
Quantum Physics

Background:

Simulating excited-state dynamics in nanoscale materials is computationally challenging.
Accurate modeling is crucial for understanding energy dissipation and relaxation processes.

Purpose of the Study:

To develop a scalable computational method for nonadiabatic molecular dynamics.
To enable large-scale simulations of complex electronic processes in materials.

Main Methods:

Developed a basis-discretized nonadiabatic molecular dynamics approach.
Introduced a density-of-states (DOS) weighted discretization scheme.
Validated the method using time-dependent Schrödinger equation and fewest-switches surface hopping.

Main Results:

The new method enables large-scale simulations of millions of states.
Applied to Auger-type processes in silicon quantum dots, reducing intractable basis sets.
Biexciton and triexciton states significantly broaden energy dissipation pathways and accelerate relaxation.

Conclusions:

The developed method provides an efficient and robust framework for atomistic simulations.
Enables accurate simulations of excited-state dynamics in low-dimensional and nanoscale materials.
Highlights the role of multi-exciton states in ultrafast energy dissipation.