358 citations · 924 across the 14 of their papers we have counts for
15 papers
Finitistic dimensions of formal power series rings
Xiaolei Zhang, Weiheng Xia
We consider the big finitistic projective and flat dimensions of a commutative ring and of its formal power series ring. When the ring is Noetherian, both invariants increase by on…
Successive orthorhombic distortions in kagome metals by molecular orbital formation
Ryo Misawa, Shunsuke Kitou, Rinsuke Yamada +12
The kagome lattice, with its inherent frustration, hosts a plethora of exotic phenomena, including the emergence of charge density wave order. The high rotational sym…
Perfectly harmonic spin cycloid and multi- textures in the Weyl semimetal GdAlSi
Ryota Nakano, Rinsuke Yamada, Juba Bouaziz +18
A fundamental question concerns how topological electronic states are influenced by many-body correlations, and magnetic Weyl semimetals represent an important material platform to…
Emergence of ferroelectric topological insulator as verified by quantum Hall effect of surface states in (Sn,Pb,In)Te films
Ryutaro Yoshimi, Ryosuke Kurihara, Yoshihiro Okamura +9
Emergent phenomena arising from nontrivial band structures based on topology and symmetry have been attracting keen interest in contemporary condensed-matter physics. Materials suc…
This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface
Ilya Belopolski, Ryota Watanabe, Yuki Sato +19
Quantum materials governed by emergent topological fermions have become a cornerstone of physics. Dirac fermions in graphene form the basis for moiré quantum matter, and Dirac ferm…
Gapped nodal planes drive a large topological Nernst effect in a chiral lattice antiferromagnet
N. D. Khanh, S. Minami, M. Hirschmann +15
The electronic structure of compensated antiferromagnets (CAF) has drawn attention for its ability to create large responses, reminiscent of ferromagnets and suitable for data stor…
Terahertz lattice and charge dynamics in ferroelectric semiconductor SnPbTe
Y. Okamura, H. Handa, R. Yoshimi +5
The symmetry breaking induced by the ferroelectric transition often triggers the emergence of topological electronic states such as Weyl fermions in ferroelectric-like metals/semim…
Photovoltaic effect by soft phonon excitation
Yoshihiro Okamura, Takahiro Morimoto, Naoki Ogawa +7
Photodetection is an indispensable function of optoelectronic devices in modern communication and sensing systems. Contrary to the near-infrared/visible regions, the fast and sensi…
Experimental signature of parity anomaly in semi-magnetic topological insulator
M. Mogi, Y. Okamura, M. Kawamura +9
A three-dimensional topological insulator features a two-dimensional surface state consisting of a single linearly-dispersive Dirac cone. Under broken time-reversal symmetry, the s…
Microwave directional dichroism resonant with spin excitations in the polar ferromagnet GaVS
Y. Okamura, S. Seki, S. Bordács +4
We have investigated the directional dichroism of magnetic resonance spectra in the polar ferromagnet GaVS. While four types of structural domains are energetically degener…
Element-specific soft X-ray spectroscopy, scattering and imaging studies of skyrmion-hosting compound CoZnMn
V. Ukleev, Y. Yamasaki, D. Morikawa +10
A room-temperature skyrmion-hosting compound CoZnMn has been examined by means of soft X-ray absorption spectroscopy, resonant small-angle scattering and extended refer…
Propagating spin excitations along skyrmion strings
S. Seki, M. Garst, J. Waizner +6
Magnetic skyrmions, topological solitons characterized by a two-dimensional swirling spin texture, have recently attracted attention as stable particle-like objects. In a three-dim…
Current-induced viscoelastic topological unwinding of metastable skyrmion strings
F. Kagawa, H. Oike, W. Koshibae +5
In the MnSi bulk chiral magnet, magnetic skyrmion strings of 17 nm in diameter appear in the form of a lattice, penetrating the sample thickness, 10-1,000 um. Although such a bundl…
Nonreciprocal spin wave propagation in chiral-lattice ferromagnets
S. Seki, Y. Okamura, K. Kondou +8
Spin current, i.e. the flow of spin angular momentum or magnetic moment, has recently attracted much attention as the promising alternative for charge current with better energy ef…
Observation of magnetic excitations of skyrmion crystal in a helimagnetic insulator
Y. Onose, Y. Okamura, S. Seki +2
The skyrmion is a topologically stable spin texture, in which the spin direction wraps a sphere. The topological nature gives rise to emergent electromagnetic phenomena such as top…