Kyoto University

Role of d-electron density of states in the quantum size effect of Pt-Ni and Pt-Pd nanoparticles

S. Kitagawa, T. Ihara, Y. Kinoshita +3

We investigated the quantum size effect (QSE) in bimetallic Pt $_{1 - x}$ Pd $_{x}$ and Pt $_{1 - x}$ Ni $_{x}$ nanoparticles, using $^{195}$ Pt nuclear magnetic resonance measurements. The tempe…

cond-mat.str-el2026★ 1 cited

Dipolar-driven mean-field criticality in the ferrimagnet Eu $_{2}$ MnSi $_{2}$ O $_{7}$

Masahiro Kawamata, Maxim Avdeev, Yusuke Nambu

We report mean-field critical behavior in Eu $_{2}$ MnSi $_{2}$ O $_{7}$ , a melilite-type ferrimagnet with spin-only Eu $^{2 +}$ and Mn $^{2 +}$ moments and negligible orbital contributions. Magn…

Intrinsic Magnetic Excitations and Heavy-Fermion Formation in the Frustrated Mn Pyrochlore System YMn $_{2 + δ}$ Zn $_{20 - x} X_{x}$ ( $X$ = In and Al) Revealed by Nuclear Magnetic Resonance and Nuclear Quadrupole Resonance Measurements

Shunsaku Kitagawa, Kenji Ishida, Yoshihiko Okamoto +1

We performed nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements to investigate the microscopic electronic states of the $d$ -electron heavy-fermion…

cond-mat.str-el2026★ 1 cited

Microscopic evidence for imaginary charge density wave in a kagome metal

S. Suetsugu, F. Hori, M. Shibata +9

Dissipationless charge transport without any energy loss is one of the most fascinating phenomena in condensed matter physics. This extraordinary state manifests in two well-establ…

Multi-probe detection of domain nucleation across the metal-insulator transition in VO $_{2}$

Shubhankar Paul, Giordano Mattoni, Amitava Ghosh +7

Electronic and structural degrees of freedom are often intimately coupled in strongly correlated systems, which result in intriguing macroscopic and microscopic phenomena. Using th…

Spinon shift current in a noncentrosymmetric quantum spin chain

Ryosuke Yamashita, Shintaro Takayoshi, Takahiro Morimoto

We theoretically study direct current generation in a quantum spin chain induced by spinon excitations by light irradiation. We consider a $S = 1/2$ one-dimensional (1D) antiferromag…

cond-mat.str-el2026★ 1 cited

The toric code under antiferromagnetic isotropic Heisenberg interactions

Won Jang, Robert Peters, Thore Posske

We investigate the impact of an isotropic antiferromagnetic Heisenberg perturbation on the toric code, focusing on the resulting quantum phase transition and the nature of the phas…

Microscopic Determination of the c-axis-Oriented Antiferromagnetic Structure in LaMnSi by $^{55}$ Mn and $^{139}$ La NMR

Yusuke Sakai, Fumiya Hori, Hiroki Matsumura +4

We report a microscopic investigation of the magnetic structure and electronic properties of LaMnSi in its antiferromagnetic (AFM) state using nuclear magnetic resonance (NMR). Fie…

Magneto-optical Kerr effect measurements under bipolar pulsed magnetic fields

Soichiro Yamane, Sota Nakamura, Atsutoshi Ikeda +3

The magneto-optical Kerr effect (MOKE) is a powerful probe of magnetism. Its contact-free optical nature makes it potentially well suitable for measurements under pulsed magnetic f…

Quantum geometry in correlated electron phases: from flat band to dispersive band

Taisei Kitamura, Akito Daido, Youichi Yanase

Quantum geometry, describing the geometric properties of the Bloch wave function in momentum space, has recently been recognized as a fundamental concept in condensed matter physic…

Microscopic origin of period-four stripe charge-density-wave in kagome metal CsV $_{3}$ Sb $_{5}$

Yuma Murata, Rina Tazai, Youichi Yamakawa +2

The interplay between unconventional density waves and exotic superconductivity has attracted growing interest. Kagome superconductors $A V_{3} Sb_{5}$ ($A = \rm{K}, \rm{Rb}, \…

Modulated symmetries from generalized Lieb-Schultz-Mattis anomalies

Hiromi Ebisu, Bo Han, Weiguang Cao

Symmetries rigidly delimit the landscape of quantum matter. Recently uncovered spatially modulated symmetries, whose actions vary with position, enable excitations with restricted…

Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA

Makoto Shimizu, Youichi Yanase

Pressure-induced changes in the magnetic and superconducting properties of a spin-triplet superconductor candidate UTe $_{2}$ have attracted considerable interest, underscoring the ne…

Matrix product state classification of 1D multipole symmetry protected topological phases

Takuma Saito, Weiguang Cao, Bo Han +1

Spatially modulated symmetries are one of the new types of symmetries whose symmetry actions are position dependent. Yet exotic phases resulting from these spatially modulated symm…

Origin of pressure-induced anomalies in the nodal-line ferrimagnet Mn $_{3}$ Si $_{2}$ Te $_{6}$

Varun Venkatasubramanian, Makoto Shimizu, Daniel Guterding +1

A pressure-induced insulator-to-metal transition (IMT) has recently been discovered in the nodal-line ferrimagnet Mn $_{3}$ Si $_{2}$ Te $_{6}$ . The electronic phase transition is accompanied…

Symmetric entanglers for non-invertible SPT phases

Minyoung You

It has been suggested that non-invertible symmetry protected topological phases (SPT), due to the lack of a stacking structure, do not have symmetric entanglers (globally symmetric…

Unified Description of Spin-Lattice Coupling and Thermodynamics in the Pyrochlore Heisenberg Antiferromagnet

Masaki Gen, Hidemaro Suwa, Shusaku Imajo +6

We study an extended model to describe the spin-lattice coupling, incorporating individual vibrations of bonds and atomic sites alongside distance-dependent exchange interactions.…

Unified description of cuprate superconductors by fractionalized electrons emerging from integrated analyses of photoemission spectra and quasiparticle interference

Shiro Sakai, Youhei Yamaji, Fumihiro Imoto +6

Electronic structure of high-temperature superconducting cuprates is studied by analyzing experimental data independently obtained from two complementary spectroscopies, one, quasi…

cond-mat.str-el2025★ 4 cited

Antiferromagnetic Order and Magnetic Frustration in the Honeycomb Heavy-Fermion System Ce(Pt $_{1 - x}$ Pd $_{x}$ ) $_{6}$ Al $_{3}$ : $^{27}$ Al and $^{195}$ Pt NMR Studies

Shunsaku Kitagawa, Fumiya Hori, Kenji Ishida +4

Heavy-fermion systems with magnetic frustration offer a rich platform for investigating the interplay among Kondo screening, magnetic frustration, and quantum criticality. We repor…

Growth of ultra-clean single crystals of RuO2

Shubhankar Paul, Giordano Mattoni, Hisakazu Matsuki +4

We report the details of the growth of ultra-clean single crystals for RuO2, a candidate material for altermagnetism. By using a crystal-growth tube with a necking structure and pr…

cond-mat.str-el2025★ 3 cited

Multilayer Crystal Field states from locally broken centrosymmetry

Owen Moulding, Makoto Shimizu, Amit Pawbake +9

Local charge, spin, or orbital degrees of freedom with intersite interactions are oftentimes sufficient to construct most quantum orders. This is conventionally true for f-electron…

Bulk excitations in ultraclean $α$ -RuCl $_{3}$ : Quantitative evidence for Majorana dispersions in a Kitaev quantum spin liquid

Kumpei Imamura, Ryuichi Namba, Riku Ishioka +6

The spin-orbit coupled Mott insulator $α$ -RuCl $_{3}$ has emerged as a prime candidate for realizing the Kitaev quantum spin liquid (KQSL), characterized by Majorana quasiparticles, w…