473 citations · 1.2k across the 29 of their papers we have counts for
29 papers
Unveiling two-dimensional electron systems on ultra-wide bandgap semiconductor -GaO
Ryu Yukawa, Hiroshi Mizuseki, Suryo Santoso Putro +26
Ultra-wide bandgap (UWBG) semiconductors promise to revolutionize power electronics, yet a fundamental understanding of their interfacial electronic structure has been hindered by…
Probe position determination with multichannel I-V measurements in a two-dimensional sheet Computational method and mathematical analysis
Tomoyuki Iori, Ryu Yukawa
Atomically thin films and surfaces exhibit many distinctive two-dimensional electronic properties that are absent in bulk crystals. In situ microscale multi-probe measurements have…
Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu
Takuto Nakamura, Hiroki Sugihara, Yitong Chen +6
The Kondo effect between localized -electrons and conductive carriers leads to exotic physical phenomena. Among them, heavy-fermion (HF) systems, in which massive effective carr…
Surface valence transition in SmS by alkali metal adsorption
Takuto Nakamura, Toru Nakaya, Yoshiyuki Ohtsubo +9
The electronic structure changes of SmS surfaces under potassium (K) doping are elucidated using synchrotron-based core-level photoelectron spectroscopy and angle-resolved photoele…
Electronic structure of SrTiVO films studied by photoemission spectroscopy: Screening for a transparent electrode material
Tatsuhiko Kanda, Daisuke Shiga, Ryu Yukawa +8
This study investigated the electronic structure of SrTiVO (STVO) thin films, which are solid solutions of strongly correlated transparent conductive oxide (TCO) Sr…
Molecular beam epitaxy growth of the highly conductive oxide SrMoO
Hiroshi Takatsu, Naoya Yamashina, Daisuke Shiga +5
SrMoO is a promising material for its excellent electrical conductivity, but growing high-quality thin films remains a challenge. Here we synthesized epitaxial films of SrMoO$_…
Electronic structure of a 3x3-ordered silicon layer on Al(111)
Y. Sato, Y. Fukaya, M. Cameau +11
Electronic structure of the 3x3 ordered-phase of a silicon (Si) layer on Al(111) has been studied by angle resolved photoemission spectroscopy (ARPES) technique using synchrotron r…
Thickness dependence of electronic and crystal structures in VO ultrathin films: suppression of the collaborative Mott-Peierls transition
D. Shiga, B. E. Yang, N. Hasegawa +7
Through photoemission spectroscopy, we investigated the change in the electronic and crystal structures of dimensionality-controlled VO films coherently grown on Ti…
Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
Shoya Sakamoto, Kenichi Kaminaga, Daichi Oka +15
SmO thin film is a new Kondo system showing a resistivity upturn around 10 K and was theoretically proposed to have a topologically nontrivial band structure. We have performed har…
Tunable two-dimensional electron system at the (110) surface of SnO
J. Dai, E. Frantzeskakis, F. Fortuna +11
We report the observation of a two-dimensional electron system (2DES) at the surface of the transparent bulk insulator SnO, and the tunability of its carrier density by…
Natural van der Waals heterostructural single crystals with both magnetic and topological properties
Jiazhen Wu, Fucai Liu, Masato Sasase +8
Heterostructures having both magnetism and topology are promising materials for the realization of exotic topological quantum states while challenging in synthesis and engineering.…
Two-dimensional conducting layer on SrTiO surface induced by hydrogenation
Y. Takeuchi, R. Hobara, R. Akiyama +5
We found that a surface state induced by hydrogenation on the surface of SrTiO(001) (STO) did not obey the rigid band model, which was confirmed by in situ electrical resisti…
Relationship between charge redistribution and ferromagnetism at the heterointerface between perovskite oxides LaNiO and LaMnO
Miho Kitamura, Masaki Kobayashi, Enju Sakai +10
To investigate the relationship between the charge redistribution and ferromagnetism at the heterointerface between perovskite transition-metal oxides LaNiO (LNO) and LaMnO…
Evolution of electronic states and emergence of superconductivity in the polar semiconductor GeTe by doping valence-skipping In
M. Kriener, M. Sakano, M. Kamitani +7
GeTe is a chemically simple IV-VI semiconductor which bears a rich plethora of different physical properties induced by doping and external stimuli. These include, among others, fe…
Emergence of metallic monoclinic states of VO films induced by K deposition
Daisuke Shiga, Makoto Minohara, Miho Kitamura +3
In order to study the origin of metallization of VO induced by electron injection, we deposit K atoms onto the surface of VO films grown on TiO (001) substrates, and we…
Giant Rashba splitting of quasi-1D surface states on Bi/InAs(110)-(21)
T. Nakamura, Y. Ohtsubo, Y. Yamashita +10
Electronic states on the Bi/InAs(110)-(21) surface and its spin-polarized structure are revealed by angle-resolved photoelectron spectroscopy (ARPES), spin-resolved ARPES,…
Non-trivial surface states of samarium hexaboride at the (111) surface
Y. Ohtsubo, Y. Yamashita, K. Hagiwara +10
The peculiar metallic electronic states observed in the Kondo insulator, samarium hexaboride (SmB), has stimulated considerable attention among those studying non-trivial elect…
High-density two-dimensional electron system induced by oxygen vacancies in ZnO
T. C. Rödel, J. Dai, F. Fortuna +10
We realize a two-dimensional electron system (2DES) in ZnO by simply depositing pure aluminum on its surface in ultra-high vacuum, and characterize its electronic structure using a…
Peculiar bonding associated with atomic doping and hidden honeycombs in borophene
Chi-Cheng Lee, Baojie Feng, Marie D'angelo +6
Engineering atomic-scale structures allows great manipulation of physical properties and chemical processes for advanced technology. We show that the B atoms deployed at the center…
Converting topological insulators into topological metals within the tetradymite family
K. -W. Chen, N. Aryal, J. Dai +14
We report the electronic band structures and concomitant Fermi surfaces for a family of exfoliable tetradymite compounds with the formula , obtained as a modificatio…
Growth of Antiperovskite Oxide Ca3SnO Films by Pulsed Laser Deposition
Makoto Minohara, Ryu Yukawa, Miho Kitamura +3
We report the epitaxial growth of Ca3SnO antiperovskite oxide films on (001)-oriented cubic yttria-stabilized zirconia (YSZ) substrates by using a conventional pulsed laser deposit…
Emergence of quantum critical behavior in metallic quantum-well states of strongly correlated oxides
Masaki Kobayashi, Kohei Yoshimatsu, Taichi Mitsuhashi +7
Controlling quantum critical phenomena in strongly correlated electron systems, which emerge in the neighborhood of a quantum phase transition, is a major challenge in modern conde…
Photoemission Circular Dichroism and Spin Polarization of the Topological Surface States in Ultrathin Bi2Te3 Films
C. -Z. Xu, Y. Liu, R. Yukawa +4
Circular dichroism (CD) observed by photoemission, being sensitive to the orbital and spin angular momenta of the electronic states, is a powerful probe of the nontrivial surface s…
Dirac fermions in borophene
Baojie Feng, Osamu Sugino, Ro-Ya Liu +14
Honeycomb structures of group IV elements can host massless Dirac fermions with non-trivial Berry phases. Their potential for electronic applications has attracted great interest a…