Publications

Showing 140 results for Author: Satoshi Okamoto

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Sep, 2026

Journal

Unveiling field-transverse spin anisotropy in the spin liquid candidate α-RuCl3 via spin Hall magnetoresistance

α-RuCl3 has emerged as a possible candidate for a quantum spin liquid (QSL) that promises exotic quasiparticles relevant for fault-tolerant quantum computation. Here, we report spin-sensitive transport measurements using a proximal spin Hall metal, platinum (Pt), to probe magnetic moments in the insulator α-RuCl3. We observe spin Hall magnetoresistance (SMR), where both th…
Aug, 2026

Journal

Intrinsic topological Weyl phase transition induced by a magnetostructural transformation in a kagome magnet

Topological phase transitions provide a unique window into the interplay between structure, magnetism, and Weyl physics in magnetic Weyl semimetals. However, realizing an intrinsic Weyl phase transition between two distinct Weyl states near room temperature remains challenging. Here, we demonstrate that a magnetostructural transition effectively induces such a transition i…
Apr, 2026

Journal

Compressive strain turns 𝑠±- into 𝑑-wave pairing in a one-unit-cell La3⁢Ni2⁢O7 thin film via substrate-induced hole doping

Motivated by recent reports of ambient-pressure superconductivity in La3⁢Ni2⁢O7 films grown on LaSrAlO4, we investigate the superconducting instability in a one-unit-cell (1UC) thin film using ab initio and random-phase approximation techniques. Compared to the high-pressure bulk system, the ratio of interlayer 𝑑3⁢𝑧2−𝑟2 hopping to intralayer 𝑑𝑥2−𝑦2 hopping is suppressed in…
Apr, 2026

Journal

Unveiling in-gap states and Majorana zero modes in superconductor-topological insulator bilayer model

Interfaces between topological insulators and superconductors (SCs) are promising platforms for realizing Majorana zero modes (MZMs) via the superconducting proximity effect. We introduce a bilayer model consisting of the surface states of a three-dimensional topological insulator (3DTI) coupled to an 𝑠-wave superconductor and systematically study the role of interlayer tu…
Feb, 2026

Journal

Symmetry-engineered chiral magnetotransport in the correlated oxide SrNbO3

Chiral transport in topological materials, arising from the interplay between topology and chirality, holds significant potential for energy-efficient spintronics and quantum information technologies through dissipationless, coherent charge flow. However, the emergence of chiral transport by tuning the electronic states of novel chiral materials is largely unexplored. Here…
Jan, 2026

Journal

Electronic structure, and magnetic and superconducting pairing tendencies of the alternating single layer–bilayer stacking nickelate La5⁢Ni3⁢O11 under pressure

Nickelates have continued to surprise since their unconventional superconductivity was discovered. Recently, the layered nickelate La5Ni3O11 with hybrid single-layer and bilayer stacking showed superconductivity under high pressure. This compound combines features of La2NiO4 and La3Ni2O7, but its pairing mechanism remains to be understood. Motivated by this finding, here…
Nov, 2025

Journal

Inhomogeneity in electronic phase and flat band in magnetic kagome metal Co3Sn2S2

Co3Sn2S2 has been reported to be a Weyl semimetal with c-axis ferromagnetism below a Curie temperature of 177 K. Despite the large interest in Co3Sn2S2, the magnetic structure is still unclear. Recent studies have challenged the magnetic phase diagram of Co3Sn2S2 by reporting unusual magnetic phases including the presence of exchange bias. Here we show, using X-ray Magneti…
Sep, 2025

Journal

Electronic, magnetic, and thermodynamic properties of the kagome layer compound FeSn

Single crystals of the single kagome layer compound FeSn are investigated using x-ray and neutron scattering, magnetic susceptibility and magnetization, heat capacity, resistivity, Hall, Seebeck, thermal expansion, thermal conductivity measurements, and density functional theory (DFT). FeSn is a planar antiferromagnet below 𝑇N=365K and exhibits ferromagnetic magnetic order…
Sep, 2025

Journal

General trends of superconducting pairing and magnetic correlations in the Ruddlesden-Popper nickelate 𝑚-layered superconductors La𝑚+1⁢Ni𝑚⁢O3⁢𝑚+1

We report a comprehensive theoretical analysis of the Ruddlesden-Popper layered nickelates La𝑚+1⁢Ni𝑚⁢O3⁢𝑚+1 (𝑚=1 to 6) under pressure. These materials have recently received significant attention due to the discovery of superconductivity in some nickelates under pressure. Our results suggest that, while these Ruddlesden-Popper layered nickelates display many similarities,…
Sep, 2025

Journal

Diabatic error and propagation of Majorana zero modes in interacting quantum dots systems

Motivated by recent experimental progress in realizing Majorana zero modes (MZMs) using quantum dot systems, we investigate the diabatic errors associated with the movement of those MZMs. The movement is achieved by tuning time-dependent gate potentials applied to individual quantum dots, effectively creating a moving potential wall. To probe the optimized movement of MZMs…
Sep, 2025

Journal

Synthesis and Characterization of Metastable Cobalt Honeycomb KCoAsO4

The Kitaev model has served as a long-sought-after target in the realization of a quantum spin liquid that could host Majorana Fermions. Such non-Abelian anyons could revolutionize quantum computing if properly implemented to overcome decoherence. A 3d7 electronic configuration, like Co2+, has been explored by theory and experimental work to design Kitaev materials. Here,…
Aug, 2025

Journal

Isolated spin ladders in 𝐿⁢𝑛2⁢Ti9⁢Sb11 (𝐿⁢𝑛 :La–Nd) metals

Here we present the discovery and characterization of a series of antimonides 𝐿⁢𝑛2⁢Ti9⁢Sb11 (Ln: La–Nd) that exhibit well-isolated, 𝑛=2 rare-earth spin ladders. We discuss the structure of these compounds, with a particular focus on the magnetic Ln spin ladders. Nd2⁢Ti9⁢Sb11 and Ce2⁢Ti9⁢Sb11 exhibit antiferromagnetic interactions and a well-defined doublet ground state, wh…

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Publications

Unveiling field-transverse spin anisotropy in the spin liquid candidate α-RuCl3 via spin Hall magnetoresistance

Intrinsic topological Weyl phase transition induced by a magnetostructural transformation in a kagome magnet

Compressive strain turns 𝑠±- into 𝑑-wave pairing in a one-unit-cell La3⁢Ni2⁢O7 thin film via substrate-induced hole doping

Unveiling in-gap states and Majorana zero modes in superconductor-topological insulator bilayer model

Symmetry-engineered chiral magnetotransport in the correlated oxide SrNbO3

Electronic structure, and magnetic and superconducting pairing tendencies of the alternating single layer–bilayer stacking nickelate La5⁢Ni3⁢O11 under pressure

Inhomogeneity in electronic phase and flat band in magnetic kagome metal Co3Sn2S2

Electronic, magnetic, and thermodynamic properties of the kagome layer compound FeSn

General trends of superconducting pairing and magnetic correlations in the Ruddlesden-Popper nickelate 𝑚-layered superconductors La𝑚+1⁢Ni𝑚⁢O3⁢𝑚+1

Diabatic error and propagation of Majorana zero modes in interacting quantum dots systems

Synthesis and Characterization of Metastable Cobalt Honeycomb KCoAsO4

Isolated spin ladders in 𝐿⁢𝑛2⁢Ti9⁢Sb11 (𝐿⁢𝑛 :La–Nd) metals