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High harmonic generation from Kagome lattice based on multi-band semiclassical trajectory method.

Jia Li1, Chao Yu1, Yigeng Peng1

  • 1Institute of Ultrafast Optical Physics, Department of Applied Physics & MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 6, 2024
PubMed
Summary

We introduce a new multi-band semiclassical trajectory (MBSCT) method to study high harmonic generation (HHG) in solids. This method reveals how flat bands in Kagome materials influence HHG, offering a new way to probe quantum materials.

Keywords:
Kagome latticeflat bandhigh harmonic generationsemiclassical trajectory method

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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Materials science

Background:

  • High harmonic generation (HHG) is a crucial nonlinear optical phenomenon.
  • Understanding electron dynamics in solids under strong laser fields is essential.
  • Existing theoretical methods face computational challenges and limitations.

Purpose of the Study:

  • To develop a novel theoretical method, multi-band semiclassical trajectory (MBSCT), for simulating HHG in solids.
  • To investigate the impact of flat bands in Kagome-type materials on HHG.
  • To explore harmonic spectroscopy as a tool for characterizing quantum materials.

Main Methods:

  • Development and application of the multi-band semiclassical trajectory (MBSCT) method.
  • Simulation of electron transitions between bands in solids.
  • Focus on Kagome-type materials and their unique electronic structures.

Main Results:

  • The MBSCT method efficiently simulates HHG, overcoming limitations of other approaches.
  • The presence of a flat band was found to suppress the intensity of specific harmonic orders.
  • Simulations provide insights into the influence of electronic band structure on HHG.

Conclusions:

  • The MBSCT method offers a computationally efficient and accurate approach for studying HHG in solids.
  • Harmonic spectroscopy can be utilized as an all-optical method to probe nonequilibrium physics in flat-band quantum materials.
  • The study highlights the potential of HHG for characterizing novel material properties.