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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

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Published on: May 29, 2018

High-Order Harmonic Generation in Photoexcited Three-Dimensional Dirac Semimetals.

Yang Wang¹, Yu Liu¹, Jianing Zhang¹

¹State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing 100871, China.

The Journal of Physical Chemistry Letters

|August 1, 2024

Summary

High-order harmonic generation (HHG) in three-dimensional Dirac semimetals (3D-DSMs) can be controlled by electron relaxation dynamics. Time-resolved HHG (tr-HHG) offers a new spectroscopy for tracking ultrafast electron dynamics.

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Area of Science:

Condensed matter physics
Ultrafast spectroscopy
Semiconductor physics

Background:

High-order harmonic generation (HHG) is crucial for applications like materials characterization and coherent light sources.
Linking HHG to material properties and dynamics is key for practical applications.
Three-dimensional Dirac semimetals (3D-DSMs) exhibit unique electronic properties relevant to HHG.

Purpose of the Study:

To establish a connection between HHG and transient material properties via interband polarization.
To investigate the manipulation of HHG by ultrafast electronic relaxation dynamics in 3D-DSMs.
To demonstrate time-resolved HHG (tr-HHG) as a spectroscopy for electron dynamics.

Main Methods:

Engineering interband polarization in photoexcited 3D-DSMs.
Utilizing ultrafast laser pulses to excite the material and generate harmonics.
Time-resolved measurements of HHG signals to probe electron dynamics.

Main Results:

HHG in 3D-DSMs is efficiently controlled by electronic relaxation dynamics on a femtosecond timescale.
tr-HHG successfully tracks electron thermalization and electron-phonon coupling processes.
Quantitative extraction of electron-phonon coupling strength is achieved using tr-HHG.

Conclusions:

HHG can be actively controlled by manipulating electronic relaxation dynamics in 3D-DSMs.
tr-HHG serves as a powerful spectroscopic tool for probing ultrafast electron dynamics.
This work provides insights into controlling HHG and measuring electron dynamics in novel materials.