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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.
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.
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.
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