Many-body effects on high-harmonic generation in Hubbard ladders
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866908272691249152 |
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| author | Murakami, Yuta Hansen, Thomas Takayoshi, Shintaro Madsen, Lars Bojer Werner, Philipp |
| author_facet | Murakami, Yuta Hansen, Thomas Takayoshi, Shintaro Madsen, Lars Bojer Werner, Philipp |
| contents | We show how many-body effects associated with background spin dynamics control the high-harmonic generation (HHG) in Mott insulators by analyzing the two-leg ladder Hubbard model. Spin dynamics activated by the interchain hopping $t_y$ drastically modifies the HHG features. When two chains are decoupled ($t_y=0$), HHG originates from the dynamics of coherent doublon-holon pairs because of spin-charge separation. With increasing $t_y$, the doublon-holon pairs lose their coherence due to their interchain hopping and resultant spin-strings. Furthermore, the HHG signal from spin-polarons -- charges dressed by spin clouds -- leads to an additional plateau in the HHG spectrum. For large $t_y$, we identify unconventional HHG processes involving $three$ elementary excitations -- two polarons and one magnon. Our results demonstrate the nontrivial nature of HHG in strongly correlated systems, and its qualitative differences to conventional semiconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_01936 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Many-body effects on high-harmonic generation in Hubbard ladders Murakami, Yuta Hansen, Thomas Takayoshi, Shintaro Madsen, Lars Bojer Werner, Philipp Strongly Correlated Electrons Mesoscale and Nanoscale Physics Optics We show how many-body effects associated with background spin dynamics control the high-harmonic generation (HHG) in Mott insulators by analyzing the two-leg ladder Hubbard model. Spin dynamics activated by the interchain hopping $t_y$ drastically modifies the HHG features. When two chains are decoupled ($t_y=0$), HHG originates from the dynamics of coherent doublon-holon pairs because of spin-charge separation. With increasing $t_y$, the doublon-holon pairs lose their coherence due to their interchain hopping and resultant spin-strings. Furthermore, the HHG signal from spin-polarons -- charges dressed by spin clouds -- leads to an additional plateau in the HHG spectrum. For large $t_y$, we identify unconventional HHG processes involving $three$ elementary excitations -- two polarons and one magnon. Our results demonstrate the nontrivial nature of HHG in strongly correlated systems, and its qualitative differences to conventional semiconductors. |
| title | Many-body effects on high-harmonic generation in Hubbard ladders |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2407.01936 |