M. Ochi

activity

20242026

collaborators

15 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

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.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-con2026

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…

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​

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

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

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

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

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