Light-matter correlations in Quantum Floquet engineering of cavity quantum materials
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866910834859442176 |
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| author | Pérez-González, Beatriz Platero, Gloria Gómez-León, Álvaro |
| author_facet | Pérez-González, Beatriz Platero, Gloria Gómez-León, Álvaro |
| contents | Quantum Floquet engineering (QFE) seeks to generalize the control of quantum systems with classical external fields, widely known as Semi-Classical Floquet engineering (SCFE), to quantum fields. However, to faithfully capture the physics at arbitrary coupling, a gauge-invariant description of light-matter interaction in cavity-QED materials is required, which makes the Hamiltonian highly non-linear in photonic operators. We provide a non-perturbative truncation scheme of the Hamiltonian, which is valid or arbitrary coupling strength, and use it to investigate the role of light-matter correlations, which are absent in SCFE. We find that even in the high-frequency regime, light-matter correlations can be crucial, in particular for the topological properties of a system. As an example, we show that for a SSH chain coupled to a cavity, light-matter correlations break the original chiral symmetry of the chain, strongly affecting the robustness of its edge states. In addition, we show how light-matter correlations are imprinted in the photonic spectral function and discuss their relation with the topology of the bands. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2302_12290 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Light-matter correlations in Quantum Floquet engineering of cavity quantum materials Pérez-González, Beatriz Platero, Gloria Gómez-León, Álvaro Mesoscale and Nanoscale Physics Quantum Floquet engineering (QFE) seeks to generalize the control of quantum systems with classical external fields, widely known as Semi-Classical Floquet engineering (SCFE), to quantum fields. However, to faithfully capture the physics at arbitrary coupling, a gauge-invariant description of light-matter interaction in cavity-QED materials is required, which makes the Hamiltonian highly non-linear in photonic operators. We provide a non-perturbative truncation scheme of the Hamiltonian, which is valid or arbitrary coupling strength, and use it to investigate the role of light-matter correlations, which are absent in SCFE. We find that even in the high-frequency regime, light-matter correlations can be crucial, in particular for the topological properties of a system. As an example, we show that for a SSH chain coupled to a cavity, light-matter correlations break the original chiral symmetry of the chain, strongly affecting the robustness of its edge states. In addition, we show how light-matter correlations are imprinted in the photonic spectral function and discuss their relation with the topology of the bands. |
| title | Light-matter correlations in Quantum Floquet engineering of cavity quantum materials |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2302.12290 |