# Long-range correlation-induced effects at high-order harmonic generation on graphene quantum dots

**Authors:** H. K. Avetissian, A. G. Ghazaryan, Kh. V. Sedrakian, G. F. Mkrtchian  
**arXiv:** [2305.14034](https://arxiv.org/abs/2305.14034)  
**Date:** 2023-05-23  
**Summary page:** https://www.summarizepaper.com/en/paper/2305.14034v1/

## Key points

- Investigates high-order harmonic generation (HHG) in graphene quantum dots (GQDs) under intense near-infrared laser fields
- Uses mean-field approach to model GQD and its interaction with laser field
- Analysis of HHG power spectrum reveals fine structures and enhanced cutoff harmonics due to long-range correlations induced by Coulomb interaction
- Cutoff energy in GQDs scales with square root of field strength amplitude, unlike atomic HHG where it is directly proportional to pump wave intensity
- Detailed time-frequency analysis using wavelet transform uncovers spectral and temporal fine structures within HHG
- Provides deeper insights into various HHG mechanisms specific to GQDs
- Sheds light on long-range correlation effects during HHG in GQDs
- Contributes to understanding fundamental physics phenomena with potential applications in optoelectronics and ultrafast spectroscopy.

## Summary

This paper investigates the phenomenon of high-order harmonic generation (HHG) in graphene quantum dots (GQDs) under intense near-infrared laser fields. The researchers employ a mean-field approach to model the GQD and its interaction with the laser field. Their analysis of the HHG power spectrum reveals fine structures and a noticeable enhancement in cutoff harmonics, which can be attributed to long-range correlations induced by Coulomb interaction. Interestingly, unlike atomic HHG where the cutoff energy is directly proportional to the pump wave intensity, in GQDs it scales with the square root of the field strength amplitude. To gain a comprehensive understanding of the entire range of HHG spectrum, a detailed time-frequency analysis is performed using a wavelet transform. This analysis uncovers intricate details of both spectral and temporal fine structures within HHG, offering deeper insights into various HHG mechanisms specific to GQDs. Overall, this research sheds light on long-range correlation effects during high-order harmonic generation in graphene quantum dots and contributes to our understanding of fundamental physics phenomena with potential implications for future applications in areas such as optoelectronics and ultrafast spectroscopy.