412 citations · 1.5k across the 22 of their papers we have counts for
23 papers
Control of helix orientation in chiral magnets via lateral confinement
Maurice Colling, Mariia Stepanova, Mario Hentschel +7
Helimagnetic materials offer a versatile platform for spin-based device concepts owing to their long-range, tunable spiral order. Here, we demonstrate controlled manipulation of th…
Non-Hermitian topological devices with Chern insulators
Kyrylo Ochkan, Michael Wissmann, Louis Veyrat +9
Multi-terminal topological devices are a new generation of electronic devices with quantized properties robust against imperfections. In magnetic topological insulators, dissipatio…
Two-dimensional superconducting diode effect in topological insulator/superconductor heterostructure
Soma Nagahama, Yuki Sato, Minoru Kawamura +7
The superconducting diode effect (SDE) is characterized by the nonreciprocity of Cooper-pair motion with respect to current direction. In three-dimensional (3D) materials, SDE resu…
Quantum geometry in low-energy linear and nonlinear optical responses of magnetic Rashba semiconductor (Ge,Mn)Te
Tsubasa Takagi, Hikaru Watanabe, Ryutaro Yoshimi +7
Quantum geometry appears as a key factor in understanding the optical properties of quantum materials, with the anticipation on diverging or quantized responses near the Dirac and…
Electric-field control of two-dimensional ferromagnetic properties by chiral ionic gating
Hideki Matsuoka, Amaki Moriyama, Tomohiro Hori +5
Chiral molecular systems offer unique pathways to control spin and magnetism beyond conventional symmetry operations. Here, we demonstrate that chiral ionic liquids enable electric…
Control of nonreciprocal charge transport in topological insulator/superconductor heterostructures with Fermi level tuning and superconducting-layer thickness
Soma Nagahama, Yuki Sato, Minoru Kawamura +7
Nonreciprocal charge transport (NCT) is defined as a phenomenon where electrical resistance depends on the current direction. It has been drawing much attention because it sensitiv…
AC Current-Driven Magnetization Switching and Nonlinear Hall Rectification in a Magnetic Topological Insulator
Yuto Kiyonaga, Masataka Mogi, Ryutaro Yoshimi +7
Spin-orbit torque arising from the spin-orbit-coupled surface states of topological insulators enables current-induced control of magnetization with high efficiency. Here, alternat…
Non-Fermi liquid transport and strong mass enhancement near the nematic quantum critical point in FeSeTe thin films
Yuki Sato, Soma Nagahama, Ilya Belopolski +10
Unconventional superconductivity is often accompanied by non-Fermi liquid (NFL) behavior, which emerges near a quantum critical point (QCP) - a point where an electronic ordered ph…
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…
Nernst effect of high-mobility Weyl electrons in NdAlSi enhanced by a Fermi surface nesting instability
Rinsuke Yamada, Takuya Nomoto, Atsushi Miyake +7
The thermoelectric Nernst effect of solids converts heat flow to beneficial electronic voltages. Here, using a correlated topological semimetal with high carrier mobility in pr…
Molecular beam epitaxy of superconducting FeSeTe thin films interfaced with magnetic topological insulators
Yuki Sato, Soma Nagahama, Ilya Belopolski +7
Engineering heterostructures with various types of quantum materials can provide an intriguing playground for studying exotic physics induced by the proximity effect. Here, we repo…
Size effects on supercooling phenomena in strongly correlated electron systems: IrTe and -(BEDT-TTF)RbZn(SCN)
H. Oike, M. Suda, M. Kamitani +5
We report that the sample miniaturization of first-order-phase-transition bulk systems causes a greater degree of supercooling. From a theoretical perspective, the size effects can…
Quantized chiral edge conduction on reconfigurable domain walls of a magnetic topological insulator
K. Yasuda, M. Mogi, R. Yoshimi +5
The electronic orders in magnetic and dielectric materials form the domains with different signs of order parameters. The control of configuration and motion of the domain walls (D…
Evidence for weakly correlated oxygen holes in the highest-T cuprate superconductor HgBaCaCuO
A. Chainani, M. Sicot, Y. Fagot-Revurat +8
We study the electronic structure of HgBaCaCuO (Hg1223 ; T = 134 K) using photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). Resona…
Current-nonlinear Hall effect and spin-orbit torque magnetization switching in a magnetic topological insulator
K. Yasuda, A. Tsukazaki, R. Yoshimi +5
Precise estimation of spin Hall angle as well as successful maximization of spin-orbit torque (SOT) form a basis of electronic control of magnetic properties with spintronic functi…
Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator
K. Yasuda, A. Tsukazaki, R. Yoshimi +3
We report current-direction dependent or unidirectional magnetoresistance (UMR) in magnetic/nonmagnetic topological insulator (TI) heterostructures, Cr(BiSb)$_{2-x}…
Enhanced photogalvanic current in topological insulators via Fermi energy tuning
K. N. Okada, N. Ogawa, R. Yoshimi +4
We achieve the enhancement of circular photogalvanic effect arising from the photo-injection of spins in topological insulator thin films by tuning the Fermi level (). A…
Fermi level dependent charge-to-spin current conversion by Dirac surface state of topological insulators
K. Kondou, R. Yoshimi, A. Tsukazaki +6
The spin-momentum locking at the Dirac surface state of a topological insulator (TI) offers a distinct possibility of a highly efficient charge-to-spin current (C-S) conversion com…
Quantum Hall States Stabilized in Semi-magnetic Bilayers of Topological Insulators
R. Yoshimi, K. Yasuda, A. Tsukazaki +4
By breaking the time-reversal-symmetry in three-dimensional topological insulators with introduction of spontaneous magnetization or application of magnetic field, the surface stat…
Discretized Topological Hall Effect Emerging from Skyrmions in Constricted Geometry
N. Kanazawa, M. Kubota, A. Tsukazaki +6
We investigate the skyrmion formation process in nano-structured FeGe Hall-bar devices by measurements of topological Hall effect, which extracts the winding number of a spin textu…
Quantum Hall Effect on Top and Bottom Surface States of Topological Insulator (Bi1-xSbx)2Te3 Films
R. Yoshimi, A. Tsukazaki, Y. Kozuka +6
The three-dimensional (3D) topological insulator (TI) is a novel state of matter as characterized by two-dimensional (2D) metallic Dirac states on its surface. Bi-based chalcogenid…
Systematic Variations in the Charge-Glass-Forming Ability of Geometrically Frustrated -(BEDT-TTF) Organic Conductors
T. Sato, F. Kagawa, K. Kobayashi +7
The critical cooling rate above which charge ordering is kinetically avoided upon cooling, which results in charge-glass formation, was investigated for the geometrical…