study

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

• Spintronics and valleytronics using the gyromagnetic effect
• Microscopic theory of tunneling spin transport at magnetic interfaces
• Angular momentum transport in bulk atomic layer materials
• Chiral phonons

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:

• Hadron physics and spintronics
• Optics and spintronics
• Cold atomic gases and spintronics
• Astrophysics and spintronics

Below are selected papers for each topic.

1. Spintronics and valleytronics using the gyromagnetic effect

Spin current generation by rigid rotation in the presence of a magnetic field:

• “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 of spin current via spin-vorticity coupling using surface acoustic waves:

• “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).

Gyromagnetic generation of spin current via spin-vorticity coupling using liquid metal flow:

• “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 effect in a ferromagnetic cantilever:

• 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)

Theory of valley-vorticity coupling:

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

Theory of 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”, arXiv:2401.00174

Spin transport in gradient materials:

• 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) .

Einstein-de Haas nanorotor:

• W. Izumida, R. Okuyama, K. Sato, T. Kato, and M. Matsuo, “Einstein-de Haas Nanorotor”, Physical Review Letters 128, 017701 (2022). (arXiv:2106.0481).

Spin motive force by gyromagnetic effect:

• T. Funato and M. Matsuo, “Spin elastodynamic motive force”, Physical Review Letters 128, 077202 (2022).  (arXiv:2110.06552)

Gyromagnetic bifurcation:

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

 

2. Microscopic theory of tunneling spin transport at magnetic interfaces

Theory of spin current noise:

• “Spin current noise of the spin Seebeck effect and spin pumping”
  M. Matsuo, Y. Ohnuma, T. Kato, and S. Maekawa
  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”, arXiv:2308.05955 Physical Review B 109, L121405 (2024).

Spin-valley coupled transport:

• Y. Ominato, J. Fujimoto, and M. Matsuo, “Valley-dependent spin transport in monolayer transition-metal dichalcogenides”, Physica Review Letters 124, 166803 (2020)
  (arXiv:2001.08670 )

Quantum Oscillations due to spin pumping:

• Y. Ominato and M. Matsuo, “Quantum Oscillations of Gilbert Damping in Graphene”, J. Phys. Soc. Jpn. 89, 053704 (2020).

 

Microscopic theory of the spin Hall magnetoresistance:

• 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)

Spin hydrodynamics of magnon:

• R. Sano and M. Matsuo, “Breaking down the magnonic Wiedemann-Franz law in the hydrodynamic regime”, Physical Review Letters 130, 166201 (2023)

Acousto-spin transport in 2D antiferromagnets:

• 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 phonon-spin conversion:

• 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 (2019) 100-106.
  (arXiv:1901.06615)

 

6. Optics and spintronics

Spin current generation due to surface plasmons:

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

Pseudo-angular momentum conversion in optomechanics:

• D. Oue and M. Matsuo, “Twisting an optomechanical cavity”, Physical Review A 106, L041501 (2022). arXiv:1912.06772

Proposal of all-optical detection of spin fluctuations:

• T. Sato, S. Watanabe, M. Matsuo, and T. Kato, “Fluctuations in spin dynamics excited by pulsed light”, arXiv:2405.10522

 

7. Cold atomic gases and spintronics

Noise of pair-tunneling transport in the 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).

Tunneling spin transport in a quantum regime:

• Y. Sekino, Y. Ominato, H. Tajima, S. Uchino, and M. Matsuo, “Thermomagnetic anomalies by magnonic criticality in ultracold atomic transport”, arXiv:2312.04280

 

8. Astrophysics and spintronics

P-wave superfluid in a neutron matter:

• 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)