M. Ochi

activity

20192026

most citedTheoretical analysis on the possibility of superconductivity in a trilayer Ruddlesden-Popper nickelate La

_{4}

_{3}

_{10}

under pressure and its experimental examination: comparison with La

_{3}

_{2}

_{7}

135 citations · 302 across the 22 of their papers we have counts for

collaborators

22 papers

cond-mat.str-el2026

Fluctuation exchange study on the electron-hole asymmetry of the superconductivity across 1/3 filling in the trilayer Hubbard model

Yushi Yamada, Masataka Kakoi, Masayuki Ochi +1

We study within the fluctuation exchange approximation the trilayer Hubbard model where three layers of the Hubbard model are coupled by large interlayer hoppings so that the overl…

cond-mat.str-el2026

Study on the validity of IPT+parquet method as an impurity solver in DMFT focusing on orbital fluctuations

Aira Yamada, Ryota Mizuno, Masayuki Ochi +2

A breakdown of calculations with exact impurity solvers in the dynamical mean field theory in multiband systems easily occurs due to the expensive numerical cost. To overcome this…

cond-mat.supr-con2026

Theoretical study of superconductivity in freestanding infinite-layer nickelate membranes under pressure: mitigation of excess correlation enhances $T_{c}$

Mahiru Seki, Reo Kono, Naotaka Tanaka +5

We theoretically investigate a freestanding membrane of infinite-layer nickelate Nd $_{0.85}$ Sr $_{0.15}$ NiO $_{2}$ under pressure by constructing a seven-orbital effective model based…

cond-mat.supr-con2026

Nonlinear phononics in LaFeAsO: Optical control of the crystal structure toward possible enhancement of superconductivity

Shu Kamiyama, Tatsuya Kaneko, Kazuhiko Kuroki +1

Nonlinear phononics provides a route to control crystal structures through light-induced phonon excitation. In this study, we apply nonlinear phononics to an iron-based superconduc…

cond-mat.supr-con2025

Theoretical study on ambient pressure superconductivity in La $_{3}$ Ni $_{2}$ O $_{7}$ thin films : structural analysis, model construction, and robustness of $s \pm$ -wave pairing

Kensei Ushio, Shu Kamiyama, Yuto Hoshi +4

We theoretically study ambient pressure superconductivity in thin films of La $_{3}$ Ni $_{2}$ O $_{7}$ . We construct model Hamiltonians adopting the crystal structure theoretically determine…

cond-mat.str-el2025

Improvement of the simplification method for the local two-particle full-vertex towards precise frequency behavior

Ryota Mizuno, Kazuhiko Kuroki, Masayuki Ochi

Estimating the local two-particle vertex functions, which are crucial for capturing the spatial fluctuation of the effective field beyond the single-site DMFT, is still challenging…

cond-mat.mtrl-sci2025

Engineered substrates for domain control in CrSe thin-film growth: Single-domain formation on lattice-matched YSZ(111) substrate

Yusuke Tajima, Junichi Shiogai, Masayuki Ochi +2

Epitaxial thin-film growth is a versatile and powerful technique for achieving a precise control of composition, stabilizing non-equilibrium phases, tailoring growth orientation, a…

cond-mat.mtrl-sci2025

Possible high thermoelectric power factor in alkali-metal-intercalated BC $_{3}$ : anisotropic multiple valleys originating from the van Hove singularity of graphene

Ryutaro Enami, Kazuhiko Kuroki, Masayuki Ochi

We theoretically investigate the electronic structure of monolayer BC $_{3}$ and find that it hosts anisotropic multiple valleys originating from the splitting of the van Hove singula…

cond-mat.mtrl-sci2025★ 1 cited

First-principles Study of Metallic-atom Diffusion in Thermoelectric Material Mg $_{3}$ Sb $_{2}$

Masayuki Ochi, Kazutaka Nishiguchi, Chul-Ho Lee +1

Mg $_{3}$ Sb $_{2}$ is a promising thermoelectric material that consists of nontoxic and earth-abundant elements. We investigate metallic-atom diffusion in Mg $_{3}$ Sb $_{2}$ by calculating the…

cond-mat.str-el2025★ 6 cited

Nonreciprocal charge transport in polar Dirac metals with tunable spin-valley coupling

M. Kondo, M. Kimata, M. Ochi +7

Nonreciprocal charge transport in solids, where resistance is different between rightward and leftward currents, is a key function of rectifying devices in the modern electronics,…

cond-mat.supr-con2025★ 3 cited

Optical control of the crystal structure in the bilayer nickelate superconductor La3Ni2O7 via nonlinear phononics

Shu Kamiyama, Tatsuya Kaneko, Kazuhiko Kuroki +1

Superconductivity in the bilayer nickelate La $_{3}$ Ni $_{2}$ O $_{7}$ occurs when the interlayer Ni-O-Ni bond angle becomes straight under pressure, suggesting a strong relationship between…

cond-mat.supr-con2024★ 8 cited

Theoretical study of the crystal structure of the bilayer nickel oxychloride Sr $_{3}$ Ni $_{2}$ O $_{5}$ Cl $_{2}$ and analysis of possible unconventional superconductivity

Masayuki Ochi, Hirofumi Sakakibara, Hidetomo Usui +1

The discovery of superconductivity under high pressure with $T_{c}$ exceeding 80 K in a bilayer nickelate La $_{3}$ Ni $_{2}$ O $_{7}$ has led to a strong desire to realize similar high $T_{c}$ p…

cond-mat.supr-con2024★ 7 cited

Theoretical study of spin-fluctuation-mediated superconductivity in two-dimensional Hubbard models with an incipient flat band

Tetsuaki Aida, Karin Matsumoto, Daisuke Ogura +2

One promising way to enhance superconductivity is to have coexisting wide and incipient narrow bands, where the Fermi level intersecting the wide band lies just above the narrow ba…

cond-mat.mtrl-sci2024★ 14 cited

Fermi Surface Nesting Driving the RKKY Interaction in the Centrosymmetric Skyrmion Magnet Gd2PdSi3

Yuyang Dong, Yosuke Arai, Kenta Kuroda +11

The magnetic skyrmions generated in a centrosymmetric crystal were recently first discovered in Gd2PdSi3. In light of this, we observe the electronic structure by angle-resolved ph…

cond-mat.supr-con2024★ 2 cited

Theoretical study on the possibility of high $T_{c}$ s $\pm$ -wave superconductivity in the heavily hole-doped infinite layer nickelates

Hirofumi Sakakibara, Ryota Mizuno, Masayuki Ochi +2

We theoretically propose a possibility of realizing high $T_{c}$ superconductivity having $s \pm$ -wave symmetry in the heavily hole-doped infinite layer nickelates La $_{1 - x}$ Sr $_{x}$ NiO…

cond-mat.supr-con2024

Theoretical analysis of the origin of the double-well band dispersion in the CuO double chains of Pr $_{2}$ Ba $_{4}$ Cu $_{7}$ O $_{15 - δ}$ and its impact on superconductivity

Toshiki Yagi, Masayuki Ochi, Kazuhiko Kuroki

Pr $_{2}$ Ba $_{4}$ Cu $_{7}$ O $_{15 - δ}$ is a unique member of cuprate superconductors where many studies suggest that CuO double chains are responsible for superconductivity. One characterist…

cond-mat.str-el2024★ 2 cited

Anomalous Fermi pockets on Hund's metal surface of Sr2RuO4 induced by the correlation-enhanced spin-orbit coupling

Takeshi Kondo, Masayuki Ochi, Shuntaro Akebi +4

The electronic structure of the topmost layer in Sr2RuO4 in the close vicinity of the Fermi level is investigated by angle-resolved photoemission spectroscopy (ARPES) with a 7-eV l…

cond-mat.supr-con2023★ 35 cited

Pair correlations of the hybridized orbitals in a ladder model for the bilayer nickelate La $_{3}$ Ni $_{2}$ O $_{7}$

Masataka Kakoi, Tatsuya Kaneko, Hirofumi Sakakibara +2

To clarify the nature of high-temperature superconductivity in the bilayer nickelate La $_{3}$ Ni $_{2}$ O $_{7}$ under pressure, we investigate, using the density-matrix renormalization grou…

cond-mat.supr-con2023★ 62 cited

Pair correlations in the two-orbital Hubbard ladder: Implications on superconductivity in the bilayer nickelate La $_{3}$ Ni $_{2}$ O $_{7}$

Tatsuya Kaneko, Hirofumi Sakakibara, Masayuki Ochi +1

Motivated by high-temperature superconductivity in pressurized La $_{3}$ Ni $_{2}$ O $_{7}$ , we investigate the pair correlations in the two-orbital Hubbard ladder, which consists of the near…

cond-mat.supr-con2023★ 135 cited

Theoretical analysis on the possibility of superconductivity in a trilayer Ruddlesden-Popper nickelate La $_{4}$ Ni $_{3}$ O $_{10}$ under pressure and its experimental examination: comparison with La $_{3}$ Ni $_{2}$ O $_{7}$

Hirofumi Sakakibara, Masayuki Ochi, Hibiki Nagata +9

We study the possibility of superconductivity in a trilayer Ruddlesden-Popper nickelate La $_{4}$ Ni $_{3}$ O $_{10}$ under pressure both theoretically and experimentally, making comparison…

cond-mat.mtrl-sci2023★ 18 cited

Pseudogap and Fermi arc induced by Fermi surface nesting in a centrosymmetric skyrmion magnet

Yuyang Dong, Yuto Kinoshita, Masayuki Ochi +12

Skyrmions in noncentrosymmetric materials are believed to occur due to the Dzyaloshinskii-Moriya interaction. By contrast, the skyrmion formation mechanism in centrosymmetric mater…

cond-mat.mtrl-sci2019★ 9 cited

First-principles study of LaOPbBiS $_{3}$ and its analogous compounds as thermoelectric materials

Keiya Kurematsu, Masayuki Ochi, Hidetomo Usui +1

LaOBiPbS $_{3}$ is a kind of pnictogen-dichalcogenide layered compounds, which have recently been experimentally investigated as thermoelectric materials owing to their low thermal co…

Fluctuation exchange study on the electron-hole asymmetry of the superconductivity across 1/3 filling in the trilayer Hubbard model

Study on the validity of IPT+parquet method as an impurity solver in DMFT focusing on orbital fluctuations

Theoretical study of superconductivity in freestanding infinite-layer nickelate membranes under pressure: mitigation of excess correlation enhances Tc​

Nonlinear phononics in LaFeAsO: Optical control of the crystal structure toward possible enhancement of superconductivity

Theoretical study on ambient pressure superconductivity in La3​Ni2​O7​ thin films : structural analysis, model construction, and robustness of s±-wave pairing

Improvement of the simplification method for the local two-particle full-vertex towards precise frequency behavior

Engineered substrates for domain control in CrSe thin-film growth: Single-domain formation on lattice-matched YSZ(111) substrate

Possible high thermoelectric power factor in alkali-metal-intercalated BC3​: anisotropic multiple valleys originating from the van Hove singularity of graphene

First-principles Study of Metallic-atom Diffusion in Thermoelectric Material Mg3​Sb2​