Intrinsic Temporal Coherence Governs Heat Transport of Zone-Folded Phonons
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918420299120640 |
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| author | Huang, Xiaoyu Ni, Yuxiang Zhang, Zhongwei Guo, Yangyu Bescond, Marc Nomura, Masahiro Volz, Sebastian |
| author_facet | Huang, Xiaoyu Ni, Yuxiang Zhang, Zhongwei Guo, Yangyu Bescond, Marc Nomura, Masahiro Volz, Sebastian |
| contents | While spatial phonon coherence manifested through band folding is believed to be a key factor governing the anomalous thermal conductivity of periodic structures, we investigate phonon transport from the perspective of temporal coherence. Using mode-resolved analyses, we quantify temporal coherent contributions and elucidate the interplay between phonon coherence time and lifetime in heat conduction of graphene/hexagonal boron nitride superlattices. We find that intrinsic coherence of folded phonon modes dominates the enhancement in ultrashort-period superlattices. In contrast, Wigner transport equation yields only a minor effect of band folding on thermal conductivity. The predictions in temperature dependence of models with and without temporal coherence provide a falsifiable experimental signature of this effect. Temporal coherence therefore constitutes a previously overlooked but fundamental channel for heat conduction, extending the conventional picture of spatially coherent transport and deepening the understanding of phonon dynamics in superlattices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_29642 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Intrinsic Temporal Coherence Governs Heat Transport of Zone-Folded Phonons Huang, Xiaoyu Ni, Yuxiang Zhang, Zhongwei Guo, Yangyu Bescond, Marc Nomura, Masahiro Volz, Sebastian Mesoscale and Nanoscale Physics While spatial phonon coherence manifested through band folding is believed to be a key factor governing the anomalous thermal conductivity of periodic structures, we investigate phonon transport from the perspective of temporal coherence. Using mode-resolved analyses, we quantify temporal coherent contributions and elucidate the interplay between phonon coherence time and lifetime in heat conduction of graphene/hexagonal boron nitride superlattices. We find that intrinsic coherence of folded phonon modes dominates the enhancement in ultrashort-period superlattices. In contrast, Wigner transport equation yields only a minor effect of band folding on thermal conductivity. The predictions in temperature dependence of models with and without temporal coherence provide a falsifiable experimental signature of this effect. Temporal coherence therefore constitutes a previously overlooked but fundamental channel for heat conduction, extending the conventional picture of spatially coherent transport and deepening the understanding of phonon dynamics in superlattices. |
| title | Intrinsic Temporal Coherence Governs Heat Transport of Zone-Folded Phonons |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2603.29642 |