Giant Thermal-Conductivity Enhancement from Pseudo-Angular Momentum Conservation
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arXiv
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| Format: | Preprint |
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2026
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| author | Wang, Tingting Zha, Dabao Chen, Hao Gong, Jiangbin Zhang, Lifa |
| author_facet | Wang, Tingting Zha, Dabao Chen, Hao Gong, Jiangbin Zhang, Lifa |
| contents | Pseudo-angular momentum (PAM) underlies optical selection rules for chiral phonons, but whether it also constrains thermally populated finite-q phonon-phonon scattering has remained unresolved. We show that rotational or screw eigenphase conservation imposes a PAM residue rule on cubic anharmonic vertices, revealing a hidden selection rule for heat transport. In screw-symmetric helical Te, an exact platform, implementing this rule as a projector in first-principles Boltzmann transport leaves spectra and force constants unchanged but removes roughly two thirds of kinematically allowed triplets, suppresses resistive Umklapp relaxation, and enhances lattice thermal conductivity by a factor of 5.30 at 300 K, remaining above fivefold up to 400 K. A bulk chiral-crystal benchmark further shows that explicit eigenphase organization can increase the calculated lattice thermal conductivity by about 24%, comparable to the reported first-principles underestimation of experiment. These results establish PAM conservation as an anharmonic selection principle for chiral-phonon heat transport and identify symmetry-resolved PAM conservation as a route to predicting and controlling thermal conductivity in chiral crystals and nanoscale phononics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2606_00546 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Giant Thermal-Conductivity Enhancement from Pseudo-Angular Momentum Conservation Wang, Tingting Zha, Dabao Chen, Hao Gong, Jiangbin Zhang, Lifa Materials Science Pseudo-angular momentum (PAM) underlies optical selection rules for chiral phonons, but whether it also constrains thermally populated finite-q phonon-phonon scattering has remained unresolved. We show that rotational or screw eigenphase conservation imposes a PAM residue rule on cubic anharmonic vertices, revealing a hidden selection rule for heat transport. In screw-symmetric helical Te, an exact platform, implementing this rule as a projector in first-principles Boltzmann transport leaves spectra and force constants unchanged but removes roughly two thirds of kinematically allowed triplets, suppresses resistive Umklapp relaxation, and enhances lattice thermal conductivity by a factor of 5.30 at 300 K, remaining above fivefold up to 400 K. A bulk chiral-crystal benchmark further shows that explicit eigenphase organization can increase the calculated lattice thermal conductivity by about 24%, comparable to the reported first-principles underestimation of experiment. These results establish PAM conservation as an anharmonic selection principle for chiral-phonon heat transport and identify symmetry-resolved PAM conservation as a route to predicting and controlling thermal conductivity in chiral crystals and nanoscale phononics. |
| title | Giant Thermal-Conductivity Enhancement from Pseudo-Angular Momentum Conservation |
| topic | Materials Science |
| url | https://arxiv.org/abs/2606.00546 |