Wave-packet numerical investigation of thermal diffuse scattering: A time-dependent quantum approach to electron...

Area of Science:

• Solid State Physics
• Materials Science
• Quantum Mechanics

Background:

• Electron diffraction is sensitive to lattice vibrations.
• Thermal diffuse scattering (TDS) affects diffraction patterns.
• Coherent diffraction patterns degrade with increasing temperature.

Purpose of the Study:

• Investigate the impact of TDS on electron diffraction.
• Develop a computational method to model TDS effects.
• Explain the suppression of coherent diffraction features.

Main Methods:

• Combined frozen phonon approximation with time-dependent Schrödinger equation.
• Used Einstein's model for phonon configurations.
• Averaged over multiple electron diffraction events.

Main Results:

• Demonstrated gradual suppression of coherent diffraction features due to thermal incoherence.
• Showed increased lattice atomic vibrations reduce pattern coherence.
• Validated the method on reduced and full 3D systems.

Conclusions:

• The developed method accurately models TDS effects on electron diffraction.
• This approach offers an alternative to Debye-Waller factors for TDS.
• The simulation results align with experimental observations.