Observation of orbital-angular-momentum-driven temperature modulation via the spin Peltier effect
Abstract
Angular-momentum transport provides a pathway for controlling energy flow in solids beyond conventional charge-based mechanisms. While spin currents are known to mediate spin-caloritronic phenomena such as the spin Peltier effect (SPE), the role of orbital angular momentum in heat transport remains largely unexplored. Here we demonstrate orbital-angular-momentum-driven temperature modulation via the SPE in yttrium iron garnet/Pt/CuOx heterostructures. Using wedge-shaped CuOx layers combined with spatially resolved active thermal measurement techniques, we map the continuous thickness dependence and quantitatively disentangle the spin- and orbital-current-mediated contributions within a single device. The orbital-mediated component exhibits a pronounced maximum at an intermediate thickness, revealing a characteristic length scale for interfacial orbital-angular-momentum generation and propagation at the Cu/CuOx interface. These results provide direct experimental evidence that charge-current-driven orbital angular momentum can drive SPE-induced temperature modulation, establishing interfacial orbital processes as an additional channel for heat transport and providing a pathway toward spin-orbit caloritronics.
Versions
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BibTeX
@misc{park2026observation,
title = {{Observation of orbital-angular-momentum-driven temperature modulation via the spin Peltier effect}},
author = {Sang J. Park and Tsuneyoshi Kan and Takamasa Hirai and Ken-ichi Uchida},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2606.12992},
eprint = {2606.12992},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.12992},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Observation of orbital-angular-momentum-driven temperature modulation via the spin Peltier effect
AU - Sang J. Park
AU - Tsuneyoshi Kan
AU - Takamasa Hirai
AU - Ken-ichi Uchida
PY - 2026
DA - 2026/08/20
PB - arXiv
DO - 10.48550/arxiv.2606.12992
UR - https://arxiv.org/abs/2606.12992
AB - Angular-momentum transport provides a pathway for controlling energy flow in solids beyond conventional charge-based mechanisms. While spin currents are known to mediate spin-caloritronic phenomena such as the spin Peltier effect (SPE), the role of orbital angular momentum in heat transport remains largely unexplored. Here we demonstrate orbital-angular-momentum-driven temperature modulation via the SPE in yttrium iron garnet/Pt/CuOx heterostructures. Using wedge-shaped CuOx layers combined with spatially resolved active thermal measurement techniques, we map the continuous thickness dependence and quantitatively disentangle the spin- and orbital-current-mediated contributions within a single device. The orbital-mediated component exhibits a pronounced maximum at an intermediate thickness, revealing a characteristic length scale for interfacial orbital-angular-momentum generation and propagation at the Cu/CuOx interface. These results provide direct experimental evidence that charge-current-driven orbital angular momentum can drive SPE-induced temperature modulation, establishing interfacial orbital processes as an additional channel for heat transport and providing a pathway toward spin-orbit caloritronics.
ER -