Anomalous Thermal Transport Reveals Weak First-Order Melting of Charge Density Waves in 2H-TaSe2
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911605350989824 |
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| author | Huang, Han Dai, Jinghang Christiansen-Salameh, Joyce Kim, Jiyoung Kielar, Samuel Ma, Desheng Schinitzer, Noah Ni, Danrui Alvarez, Gustavo Li, Chen Slebodnick, Carla Medina, Mario Azhar, Bilal Alatas, Ahmet Cava, Robert Muller, David Tian, Zhiting |
| author_facet | Huang, Han Dai, Jinghang Christiansen-Salameh, Joyce Kim, Jiyoung Kielar, Samuel Ma, Desheng Schinitzer, Noah Ni, Danrui Alvarez, Gustavo Li, Chen Slebodnick, Carla Medina, Mario Azhar, Bilal Alatas, Ahmet Cava, Robert Muller, David Tian, Zhiting |
| contents | How ordered phases melt in low-dimensional quantum materials remain difficult to resolve because the relevant fluctuations are dynamic and charge neutral. In this work, we show that thermal transport provides a sensitive probe of these hidden fluctuations in the layered transition metal dichalcogenide 2H-TaSe2. We observe a striking V-shaped temperature dependence of the thermal conductivity that cannot be explained by conventional phonon-phonon scattering. Instead, it originates from scattering by persistent local charge-density-wave (CDW) correlations, consistent with our phenomenological model linking thermal transport to spatial CDW fluctuation. Electron diffraction reveals short-range periodic lattice distortions persisting to at least 300 K, while X-ray diffraction shows thermal hysteresis of the CDW wavevector. Together, these results reveal a dislocation- and fluctuation-driven weak first-order melting of the CDW state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_15915 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Anomalous Thermal Transport Reveals Weak First-Order Melting of Charge Density Waves in 2H-TaSe2 Huang, Han Dai, Jinghang Christiansen-Salameh, Joyce Kim, Jiyoung Kielar, Samuel Ma, Desheng Schinitzer, Noah Ni, Danrui Alvarez, Gustavo Li, Chen Slebodnick, Carla Medina, Mario Azhar, Bilal Alatas, Ahmet Cava, Robert Muller, David Tian, Zhiting Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science How ordered phases melt in low-dimensional quantum materials remain difficult to resolve because the relevant fluctuations are dynamic and charge neutral. In this work, we show that thermal transport provides a sensitive probe of these hidden fluctuations in the layered transition metal dichalcogenide 2H-TaSe2. We observe a striking V-shaped temperature dependence of the thermal conductivity that cannot be explained by conventional phonon-phonon scattering. Instead, it originates from scattering by persistent local charge-density-wave (CDW) correlations, consistent with our phenomenological model linking thermal transport to spatial CDW fluctuation. Electron diffraction reveals short-range periodic lattice distortions persisting to at least 300 K, while X-ray diffraction shows thermal hysteresis of the CDW wavevector. Together, these results reveal a dislocation- and fluctuation-driven weak first-order melting of the CDW state. |
| title | Anomalous Thermal Transport Reveals Weak First-Order Melting of Charge Density Waves in 2H-TaSe2 |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2603.15915 |