Phonon Dichroisms Revealing Unusual Electronic Quantum Geometry
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917095639351296 |
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| author | Li, Ding Yang, Guoao Qin, Tao Zhou, Jianhui Yao, Yugui |
| author_facet | Li, Ding Yang, Guoao Qin, Tao Zhou, Jianhui Yao, Yugui |
| contents | The quantum geometry tensor, intrinsic geometric characteristics of electronic states, plays a crucial role in the various nontrivial electromagnetic phenomena in quantum materials. Here, we reveal that quantum geometry significantly modifies phonon dichroisms through electron-phonon interactions in solids that break time-reversal and spatial inversion symmetries. Specifically, the circular phonon dichroism is primarily dominated by the heat magnetic moments, while the linear phonon dichroism depends on the heat Drude weight, a thermal analog of band Drude weight. Furthermore, we establish the f-sum rule for the heat magnetic moment that facilitates its experimental detections. We demonstrate our key findings in an archetypal model system: ferromagnetic two-dimensional electron gases with Rashba spin-orbit coupling. Our work uncovers the quantum-geometric origin of common phonon dichroisms and predicts the detectable signature of the heat magnetic moment of electrons in solids. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_16141 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phonon Dichroisms Revealing Unusual Electronic Quantum Geometry Li, Ding Yang, Guoao Qin, Tao Zhou, Jianhui Yao, Yugui Mesoscale and Nanoscale Physics The quantum geometry tensor, intrinsic geometric characteristics of electronic states, plays a crucial role in the various nontrivial electromagnetic phenomena in quantum materials. Here, we reveal that quantum geometry significantly modifies phonon dichroisms through electron-phonon interactions in solids that break time-reversal and spatial inversion symmetries. Specifically, the circular phonon dichroism is primarily dominated by the heat magnetic moments, while the linear phonon dichroism depends on the heat Drude weight, a thermal analog of band Drude weight. Furthermore, we establish the f-sum rule for the heat magnetic moment that facilitates its experimental detections. We demonstrate our key findings in an archetypal model system: ferromagnetic two-dimensional electron gases with Rashba spin-orbit coupling. Our work uncovers the quantum-geometric origin of common phonon dichroisms and predicts the detectable signature of the heat magnetic moment of electrons in solids. |
| title | Phonon Dichroisms Revealing Unusual Electronic Quantum Geometry |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2511.16141 |