Effect of Berry connection on attosecond transient absorption spectroscopy in gapped graphene
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912452758732800 |
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| author | Yan, Jiayu Er, Hongxuan Dang, Wei Ren, Jiahuan Chen, Chao Ren, Dianxiang Dong, Fulong |
| author_facet | Yan, Jiayu Er, Hongxuan Dang, Wei Ren, Jiahuan Chen, Chao Ren, Dianxiang Dong, Fulong |
| contents | We investigate the attosecond transient absorption spectroscopy (ATAS) in gapped graphene by numerically solving the four-band density matrix equations. Our results reveal that, in contrast to pristine graphene, whose fishbone-shaped spectra oscillate at twice the pump laser frequency, the ATAS of gapped graphene exhibits an additional component oscillating at the pump laser frequency, induced by the Berry connection. To gain insight into these interesting results, we employ a simplified model to derive an analytical expression for the spectral component stemming from the Berry connection. Our analytical results qualitatively reproduce the key features observed in the numerical simulations, revealing that the intensity of the fundamental-frequency spectral component depends not only on the Berry connection but also on the energy shifts associated with the effective mass of electrons at the van Hove singularities. These results shed light on the complex generation mechanism of the ATAS in symmetry-broken materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_19286 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Effect of Berry connection on attosecond transient absorption spectroscopy in gapped graphene Yan, Jiayu Er, Hongxuan Dang, Wei Ren, Jiahuan Chen, Chao Ren, Dianxiang Dong, Fulong Mesoscale and Nanoscale Physics Atomic Physics We investigate the attosecond transient absorption spectroscopy (ATAS) in gapped graphene by numerically solving the four-band density matrix equations. Our results reveal that, in contrast to pristine graphene, whose fishbone-shaped spectra oscillate at twice the pump laser frequency, the ATAS of gapped graphene exhibits an additional component oscillating at the pump laser frequency, induced by the Berry connection. To gain insight into these interesting results, we employ a simplified model to derive an analytical expression for the spectral component stemming from the Berry connection. Our analytical results qualitatively reproduce the key features observed in the numerical simulations, revealing that the intensity of the fundamental-frequency spectral component depends not only on the Berry connection but also on the energy shifts associated with the effective mass of electrons at the van Hove singularities. These results shed light on the complex generation mechanism of the ATAS in symmetry-broken materials. |
| title | Effect of Berry connection on attosecond transient absorption spectroscopy in gapped graphene |
| topic | Mesoscale and Nanoscale Physics Atomic Physics |
| url | https://arxiv.org/abs/2506.19286 |