Observation of orbital-angular-momentum-driven temperature modulation via the spin Peltier effect
- 1National Institute for Materials Science, Tsukuba 305-0047, Japan.
- 2Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan.
Abstract
Angular-momentum transport provides a pathway for controlling energy flow in solids beyond conventional charge-based mechanisms. Although spin currents are known to mediate spin-caloritronic phenomena such as the spin Peltier effect (SPE), the role of orbital angular momentum (OAM) in heat transport remains largely unexplored. Here, we demonstrate OAM-driven temperature modulation via the SPE in yttrium-iron-garnet/Pt/CuO x heterostructures. Using wedge-shaped CuO x 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 OAM generation and propagation at the Cu/CuO x interface. These results provide direct experimental evidence that charge-current-driven OAM 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
Related
- Observation of spin-free interatomic orbital angular momentum in a chiral crystal
- Spin-to-orbital angular momentum conversion in dielectric metasurfaces
- Spin-to-orbital angular momentum conversion in dielectric metasurfaces: erratum
- Rethinking free-space orbital angular momentum quantum key distribution: encoding selection and branch-cut-length-minimized adaptive optics
- Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum
BibTeX
@article{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},
journal = {Science Advances},
year = {2026},
month = oct,
doi = {10.1126/sciadv.aej1838},
url = {https://www.science.org/doi/10.1126/sciadv.aej1838},
note = {CC BY},
}
RIS
TY - JOUR
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 - 2026/10/02
JO - Science Advances
DO - 10.1126/sciadv.aej1838
UR - https://www.science.org/doi/10.1126/sciadv.aej1838
AB - Angular-momentum transport provides a pathway for controlling energy flow in solids beyond conventional charge-based mechanisms. Although spin currents are known to mediate spin-caloritronic phenomena such as the spin Peltier effect (SPE), the role of orbital angular momentum (OAM) in heat transport remains largely unexplored. Here, we demonstrate OAM-driven temperature modulation via the SPE in yttrium-iron-garnet/Pt/CuO x heterostructures. Using wedge-shaped CuO x 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 OAM generation and propagation at the Cu/CuO x interface. These results provide direct experimental evidence that charge-current-driven OAM 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.
SN - 2375-2548
ER -