108 citations · 235 across the 9 of their papers we have counts for
9 papers
Unusual temperature dependence of the band structure associated with local atomic distortion in monolayer 1T'-WTe2
Ryuichi Ando, Katsuaki Sugawara, Tappei Kawakami +4
The ground state of monolayer 1T'-WTe2 has been a target of intensive debate on whether or not it is a two-dimensional topological insulator (2D TI) associated with exciton formati…
Selective Fabrication of Monolayer 1H- and 1T'-WTe2
Ryuichi Ando, Katsuaki Sugawara, Tappei Kawakami +2
We selectively fabricated monolayers of octahedral (1H) and distorted trigonal (1T') WTe2 on graphene/SiC(0001) by controlling the substrate temperature during epitaxy. Angle-resol…
In-situ topotactic chemical reaction for spectroscopies
Tappei Kawakami, Kosuke Nakayama, Katsuaki Sugawara +1
Topotactic chemical reaction (TCR) is a chemical process that transforms one crystalline phase to another while maintaining one or more of the original structural frameworks, typic…
Charge order with unusual star-of-David lattice in monolayer NbTe2
Taiki Taguchi, Katsuaki Sugawara, Hirofumi Oka +8
Interplay between fermiology and electron correlation is crucial for realizing exotic quantum phases. Transition-metal dichalcogenide (TMD) 1T-TaS2 has sparked a tremendous attenti…
Three-dimensional energy gap and origin of charge-density wave in kagome superconductor KV3Sb5
Takemi Kato, Yongkai Li, Tappei Kawakami +8
Kagome lattices offer a fertile ground to explore exotic quantum phenomena associated with electron correlation and band topology. The recent discovery of superconductivity coexist…
Development of a versatile micro-focused angle-resolved photoemission spectroscopy system with Kirkpatrick-Baez mirror optics
Miho Kitamura, Seigo Souma, Asuka Honma +11
Angle-resolved photoemission spectroscopy using a micro-focused beam spot (micro-ARPES) is becoming a powerful tool to elucidate key electronic states of exotic quantum materials.…
Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2
Yuki Nakata, Katsuaki Sugawara, Ashish Chainani +11
Combination of low-dimensionality and electron correlation is vital for exotic quantum phenomena such as the Mott-insulating phase and high-temperature superconductivity. Transitio…
Electronic states of multilayer VTe2: quasi-one-dimensional Fermi surface and implications to charge-density waves
T. Kawakami, K. Sugawara, T. Kato +4
We have performed angle-resolved photoemission spectroscopy on epitaxial VTe2 films to elucidate the relationship between the fermiology and charge-density waves (CDW). We found th…
Signature of band inversion in the antiferromagnetic phase of axion insulator candidate EuIn2As2
Takafumi Sato, Zhiwei Wang, Daichi Takane +12
We have performed angle-resolved photoemission spectroscopy on EuIn2As2 which is predicted to be an axion insulator in the antiferromagnetic state. By utilizing soft-x-ray and vacu…