Research¶

I mainly research non-equilibrium phenomena mediated by spin angular momentum, including the following:

1. Spintronics and valleytronics using the gyromagnetic effect

2. Microscopic theory of tunneling spin transport at magnetic interfaces

3. Angular momentum transport in bulk atomic layer materials

The above four topics are based on research in condensed matter and mesoscopic physics. In addition to these, I am actively engaged in the following cross-disciplinary themes:

5. Hadron physics and spintronics

6. Astrophysics and spintronics

7. Cold atomic gases and spintronics

8. Optics and spintronics

Below are selected papers for each topic.

1. Spintronics and Valleytronics using the Gyromagnetic Effect¶

Spin Current Generation by Rigid Rotation¶

"Effects of mechanical rotation on spin currents", M. Matsuo, J. Ieda, E. Saitoh, and S. Maekawa, Physical Review Letters 106, 076601 (2011), PRL Editors' Suggestion

Gyromagnetic Generation via Spin-Vorticity Coupling¶

Using surface acoustic waves (spin elastodynamics):¶

"Mechanical generation of spin current by spin-rotation coupling", M. Matsuo, J. Ieda, K. Harii, E. Saitoh, and S. Maekawa, Physical Review B 87, 180402(R) (2013)
"Spin current generation using a surface acoustic wave generated via spin-rotation coupling", D. Kobayashi, T. Yoshikawa, M. Matsuo, R. Iguchi, S. Maekawa, E. Saitoh, and Y. Nozaki, Physical Review Letters 119, 077202 (2017), PRL Editors' Suggestion
Y. Kurimune, M. Matsuo, and Y. Nozaki, "Observation of gyromagnetic spinwave resonance in NiFe thin films", Physical Review Letters 124, 217205 (2020)
T. Funato and M. Matsuo, "Spin elastodynamic motive force", Physical Review Letters 128, 077202 (2022) [arXiv:2110.06552]

Using liquid metal flow (spin hydrodynamics):¶

"Theory of spin hydrodynamic generation", M. Matsuo, Y. Ohnuma, and S. Maekawa, Physical Review B 96, 020401(R)(2017) [arXiv:1706.06521]
"Spin hydrodynamic generation", R. Takahashi, M. Matsuo, M. Ono, K. Harii, H. Chudo, S. Okayasu, J. Ieda, S. Takahashi, S. Maekawa, and E. Saitoh, Nature Physics 12, 52-56 (2016)
R. Takahashi, H. Chudo, M. Matsuo, K. Harii, Y. Ohnuma, S. Maekawa, and E. Saitoh, "Giant spin hydrodynamic generation in laminar flow", Nature Communications 11, 3009 (2020)

Einstein-de Haas Effects¶

K. Harii, Y.-J Seo, Y. Tsutsumi, H. Chudo, K. Oyanagi, M. Matsuo, Y. Shiomi, T. Ono, S. Maekawa, and E. Saitoh, "Spin Seebeck mechanical force", Nature Communications 10, 2616 (2019)
W. Izumida, R. Okuyama, K. Sato, T. Kato, and M. Matsuo, "Einstein-de Haas Nanorotor", Physical Review Letters 128, 017701 (2022) [arXiv:2106.0481]

Gyromagnetic valley transport¶

Y. Ominato, D. Oue, and M. Matsuo, "Valley transport driven by dynamic lattice distortion", Physical Review B 105, 195409 (2022) [arXiv:2110.09724]

Spin current generation due to differential rotation¶

T. Funato, S. Kinoshita, N. Tanahashi, S. Nakamura, and M. Matsuo, "Spin current generation due to differential rotation", Physical Review B (in press) PRB Editors' Suggestion [arXiv:2401.00174]

Spin current generation due to votical charge current¶

G. Okano, M. Matsuo, Y. Ohnuma, S. Maekawa, and Y. Nozaki, "Nonreciprocal spin current generation in surface-oxidized copper films", Physical Review Letters 122, 217701 (2019)

Gyromagnetic bifurcation¶

T. Sato, T. Kato, Daigo Oue, M. Matsuo, "Gyromagnetic bifurcation in a levitated ferromagnetic particle", Physical Review B 107, L180406 (2023)

2. Tunneling Spin Transport¶

Spin Noise/spin current noise¶

M. Matsuo, Y. Ohnuma, T. Kato, and S. Maekawa, "Spin current noise of the spin Seebeck effect and spin pumping", Physical Review Letters 120, 037201 (2018) [arXiv:1711.00237]

Tunneling Spin Transport in SC/FI¶

"Microscopic theory of spin transport at an interface between a superconductor and a ferromagnetic insulator", T. Kato, Y. Ohnuma, M. Matsuo, J. Rech, T. Jonckheere, T. Martin, Physical Review B 99, 144411 (2019) [arXiv:1901.02440]
Y. Ominato, A. Yamakage, and M. Matsuo, "Anisotropic superconducting spin transport at magnetic interfaces", Physical Review B 106, L161406 (2022) [arXiv:2103.05871]
Y. Ominato, A. Yamakage, and M. Matsuo, "Dynamical Majorana Ising spin response in a topological superconductor-magnet hybrid by microwave irradiation", Physical Review B 109, L121405 (2024) [arXiv:2308.05955]

Spin-Valley Coupled Transport¶

Y. Ominato, J. Fujimoto, and M. Matsuo, "Valley-dependent spin transport in monolayer transition-metal dichalcogenides", Physical Review Letters 124, 166803 (2020) [arXiv:2001.08670]
X. Hu, Y. Ominato, and M. Matsuo, "Spin Seebeck effect in graphene," Physical Review B 110, 245308 (2024).

Quantum Effects in Spin Transport¶

Y. Ominato and M. Matsuo, "Quantum Oscillations of Gilbert Damping in Graphene", J. Phys. Soc. Jpn. 89, 053704 (2020)
T. Kato, Y. Ohnuma, and M. Matsuo, "Microscopic theory of the spin Hall magnetoresistance", Physical Review B 102, 094437 (2020) [arXiv:2005.14494]

3. Spin Transport in Magnets¶

Mechanical Generation of Magnon Current¶

J. Fujimoto and M. Matsuo, "Magnon Current Generation by Dynamical Distortion", Physical Review B 102, 020406(R) (2020) [arXiv:2004.14707]

Magnon hydrodynamics/elastodynamics¶

R. Sano and M. Matsuo, "Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime", Physical Review Letters 130, 166201 (2023)
R. Sano, Y. Ominato, and M. Matsuo, "Acousto-magnonic spin Hall effect in honeycomb antiferromagnets", Physical Review Letters 132, 236302 (2024) [arXiv:2305.13375]

4. Chiral Phonons¶

Chirality-Induced Effects¶

T. Funato, M. Matsuo, and T. Kato, "Chirality-induced phonon-spin conversion at an interface", Physical Review Letters 132, 236201 (2024)

5. Hadron Physics and Spintronics¶

Relativistic Spin Hydrodynamics¶

K. Hattori, M. Hongo, X.-G. Huang, M. Matsuo, and H. Taya, "Fate of spin polarization in a relativistic fluid: An entropy-current analysis", Physics Letters B 795, 100-106 (2019) [arXiv:1901.06615]

6. Astrophysics and Spintronics¶

P-wave Superfluidity¶

H. Tajima, H. Funaki, Y. Sekino, N. Yasutake, and M. Matsuo, "Exploring 3P0 superfluid in dilute spin-polarized neutron matter", Physical Review C (Letter) 108, L052802 (2023)

7. Cold Atomic Gases and Spintronics¶

Transport in BCS-BEC Crossover¶

H. Tajima, D. Oue, M. Matsuo, and T. Kato, "Nonequilibrium Noise as a Probe of Pair-Tunneling Transport in the BCS–BEC Crossover", PNAS Nexus 2, pgad045 (2023)

Quantum Transport¶

Y. Sekino, Y. Ominato, H. Tajima, S. Uchino, and M. Matsuo, "Thermomagnetic anomalies by magnonic criticality in ultracold atomic transport," Physical Review Letters 133, 163402 (2024).

8. Optics and Spintronics¶

Fluctuations in spin dynamics excited by pulsed light¶

T. Sato, S. Watanabe, M. Matsuo, and T. Kato, "Fluctuations in spin dynamics excited by pulsed light," Physical Review Letters (in press) [arXiv:2405.10522]

Surface Plasmon Effects¶

D. Oue and M. Matsuo, "Effects of surface plasmons on spin currents in a thin film system", New J. Phys 22, 033040 (2020)

Optomechanical Systems¶

D. Oue and M. Matsuo, "Twisting an optomechanical cavity", Physical Review A 106, L041501 (2022) [arXiv:1912.06772]