308 citations · 1.1k across the 28 of their papers we have counts for
28 papers
Imaging Josephson Vortices on Curved Junctions
Yuita Fujisawa, Anjana Krishnadas, Barnaby R. M. Smith +5
Understanding the nature of vortices in type-II superconductors is crucial for comprehending exotic superconductors and advancing the application of superconducting materials in fu…
Imaging emergent exotic quasiparticle state in a frustrated transition metal oxide
Yuita Fujisawa, Anjana Krishnadas, Chia-Hsiu Hsu +10
The existence of rich Fermiology in anomalous metal phase in exotic superconductors has attracted considerable interests, as exemplified in copper, iron-based, and intermetallic fr…
Anomalous vortex shape in a frustrated superconductor hosting chiral multicomponent order parameters
Yuita Fujisawa, Anjana Krishnadas, Tomonori Nakamura +12
Multicomponent chiral superconductors can host spatially separated superconducting components within a single Abrikosov vortex, leading to unconventional, anisotropic vortex shapes…
Metallic delafossite thin films for unique device applications
Takayuki Harada, Yoshinori Okada
Metallic delafossites (ABO2) are layered oxides with quasi-two dimensional conduction layers. Metallic delafossites are among the most conducting materials with the in-plane conduc…
Large antiferromagnetic fluctuation enhancement of the thermopower at a critical doping in magnetic semimetal Cr1+dTe2
Atwa Mohamed, Yuita Fujisawa, Takatsugu Onishi +5
Cr1+dTe2 is a self-intercalated transition metal dichalcogenide that hosts tunable electronic filling and magnetism in its semimetallic band structure. Recent angle-resolved photoe…
Widely Tunable Berry curvature in the Magnetic Semimetal Cr1+dTe2
Y. Fujisawa, M. Pardo-Almanza, C. H. Hsu +8
Magnetic semimetals have increasingly emerged as lucrative platforms hosting spin-based topological phenomena in real and momentum spaces. Of particular interest is the emergence o…
Observation of near EF Fermi-arc van Hove singularity with prominent coupling to phonon in a van der Waals coupled Weyl semimetal
Z. Wang, Cheng-Yi Huang, Chia-Hsiu Hsu +7
A van der Waals coupled Weyl semimetal material NbIrTe4 is investigated by combining scanning tunneling microscopy/spectroscopy and first principles calculations. We observe a shar…
Visualizing superconductivity in an inversion-symmetry-broken doped Weyl semimetal
Zhenyu Wang, Jorge Olivares, Hiromasa Namiki +5
The Weyl semimetal MoTe offers a rare opportunity to study the interplay between Weyl physics and superconductivity. Recent studies have found that Se substitution can boost th…
Magnetic frustration in a van der Waals metal CeSiI
Ryutaro Okuma, Clemens Ritter, Gøran J. Nilsen +1
The realization of magnetic frustration in a metallic van der Waals (vdW) coupled material has been sought as a promising platform to explore novel phenomena both in bulk matter an…
Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2
K. Yamagami, Y. Fujisawa, B. Driesen +15
We investigate near-Fermi-energy (EF) element-specific electronic and spin states of ferromagnetic van der Waals (vdW) metal Fe5GeTe2. The soft x-ray angle-resolved photoemission s…
Tailoring Magnetism in Self-intercalated Cr1+δTe2 Epitaxial Films
Y. Fujisawa, M. Pardo-Almanza, J. Garland +13
Magnetic transition metal dichalcogenide (TMD) films have recently emerged as promising candidates to host novel magnetic phases relevant to next-generation spintronic devices. How…
Quantum oscillations with magnetic hysteresis observed in CeTe thin films
Mori Watanabe, Sanghyun Lee, Takuya Asano +7
We have performed magnetotransport measurements in CeTe thin films down to . It is known that CeTe has two magnetic transitions at $T_{\rm N1} \approx 3~{\…
Three-dimensional electronic structure in ferromagnetic with breathing kagome bilayers
Hiroaki Tanaka, Yuita Fujisawa, Kenta Kuroda +9
A large anomalous Hall effect (AHE) has been observed in ferromagnetic with breathing kagome bilayers. To understand the underlying mechanism for this,…
Disorder induced power-law gaps in an insulator-metal Mott transition
Zhenyu Wang, Yoshinori Okada, Jared O'Neal +11
A correlated material in the vicinity of an insulator-metal transition (IMT) exhibits rich phenomenology and variety of interesting phases. A common avenue to induce IMTs in Mott i…
Scanning tunneling spectroscopy of superconductivity on surfaces of LiTi2O4(111) thin films
Yoshinori Okada, Yasunobu Ando, Ryota Shimizu +4
Unique superconductivity at surfaces/interfaces, as exemplified by LaAlO3/SrTiO3 interfaces, and the high transition temperature in ultrathin FeSe films, have triggered intense deb…
Quasiparticle interference on cubic perovskite oxide surfaces
Yoshinori Okada, Tay-Rong Chang, Guoqing Chang +7
We report the first observation of coherent surface states on cubic perovskite oxide SrVO3(001) thin films through spectroscopic imaging scanning tunneling microscopy. A direct lin…
Nanoscale Determination of the Mass Enhancement Factor in the Lightly-Doped Bulk Insulator Lead Selenide
Ilija Zeljkovic, Kane L Scipioni, Daniel Walkup +10
Bismuth chalcogenides and lead telluride/selenide alloys exhibit exceptional thermoelectric properties which could be harnessed for power generation and device applications. Since…
Contrasting chemical pressure effect on the moment direction in the Kondo semiconductor CeTAl (T = Ru,Os)
D. T. Adroja, A. D. Hillier, C. Ritter +12
The opening of a spin gap in the orthorhombic compounds CeTAl (T = Ru and Os) is followed by antiferromagnetic ordering at = 27 K and 28.5 K, respectively, with a…
Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators
Ilija Zeljkovic, Yoshinori Okada, Maksym Serbyn +12
The tunability of topological surface states (SS) and controllable opening of the Dirac gap are of fundamental and practical interest in the field of topological materials. In topo…
Mapping the unconventional orbital texture in topological crystalline insulators
Ilija Zeljkovic, Yoshinori Okada, Cheng-Yi Huang +11
The newly discovered topological crystalline insulators (TCIs) harbor a complex band structure involving multiple Dirac cones. These materials are potentially highly tunable by ext…
Carrier localization and electronic phase separation in a doped spin-orbit driven Mott phase in Sr3(Ir1-xRux)2O7
Chetan Dhital, Tom Hogan, Wenwen Zhou +13
Interest in many strongly spin-orbit coupled 5d-transition metal oxide insulators stems from mapping their electronic structures to a J=1/2 Mott phase. One of the hopes is to estab…
Observation of Dirac node formation and mass acquisition in a topological crystalline insulator
Yoshinori Okada, Maksym Serbyn, Hsin Lin +13
In the recently discovered topological crystalline insulators (TCIs), topology and crystal symmetry intertwine to create surface states with a unique set of characteristics. Among…
Imaging the evolution of metallic states in a spin-orbit interaction driven correlated iridate
Yoshinori Okada, Daniel Walkup, Hsin Lin +9
The Ruddlesden-Popper (RP) series of iridates (Srn+1IrnO3n+1) have been the subject of much recent attention due to the anticipation of emergent physics arising from the cooperativ…
Ripple modulated electronic structure of a 3D topological insulator
Yoshinori Okada, Wenwen Zhou, D. Walkup +3
3D topological insulators, similar to the Dirac material graphene, host linearly dispersing states with unique properties and a strong potential for applications. A key, missing el…