CVClient

北谷 基治

キタタニ モトハル  (Motoharu Kitatani)

基本情報

所属
兵庫県立大学 理学研究科 応用数学講座 助教
学位
博士(理学)(2017年3月 東京大学)

研究者番号
50871331
ORCID ID
 https://orcid.org/0000-0003-0746-6455
J-GLOBAL ID
202001013235879558
researchmap会員ID
R000006533

学歴

 3

委員歴

 1

受賞

 1

論文

 19
  • Paul Worm, Qisi Wang, Motoharu Kitatani, Izabela Biało, Qiang Gao, Xiaolin Ren, Jaewon Choi, Diana Csontosová, Ke Jin Zhou, Xingjiang Zhou, Zhihai Zhu, Liang Si, Johan Chang, Jan M. Tomczak, Karsten Held
    Physical Review B 109(23) 2024年6月15日  査読有り
    Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (DΓA). Here, we compare the spin-fluctuation spectrum behind these calculations to resonant inelastic x-ray scattering experiments. The overall agreement is good. This independent cross validation of the strength of spin fluctuations strongly supports the scenario, advanced by DΓA, that spin fluctuations are the mediator of the superconductivity observed in nickelates.
  • Keiki Fukumoto, Seunghee Lee, Shin Ichi Adachi, Yuta Suzuki, Koichi Kusakabe, Rikuto Yamamoto, Motoharu Kitatani, Kunio Ishida, Yoshinori Nakagawa, Michael Merkel, Daisuke Shiga, Hiroshi Kumigashira
    Scientific Reports 14(1) 2024年5月  査読有り
    Topological insulators (TI) hold significant potential for various electronic and optoelectronic devices that rely on the Dirac surface state (DSS), including spintronic and thermoelectric devices, as well as terahertz detectors. The behavior of electrons within the DSS plays a pivotal role in the performance of such devices. It is expected that DSS appear on a surface of three dimensional(3D) TI by mechanical exfoliation. However, it is not always the case that the surface terminating atomic configuration and corresponding band structures are homogeneous. In order to investigate the impact of surface terminating atomic configurations on electron dynamics, we meticulously examined the electron dynamics at the exfoliated surface of a crystalline 3D TI (Bi2Se3) with time, space, and energy resolutions. Based on our comprehensive band structure calculations, we found that on one of the Se-terminated surfaces, DSS is located within the bulk band gap, with no other surface states manifesting within this region. On this particular surface, photoexcited electrons within the conduction band effectively relax towards DSS and tend to linger at the Dirac point for extended periods of time. It is worth emphasizing that these distinct characteristics of DSS are exclusively observed on this particular surface.
  • Yasuhiro Oishi, Motoharu Kitatani, Koichi Kusakabe
    Beilstein Journal of Organic Chemistry 20 570-577 2024年3月  査読有り
    We theoretically analyze possible multiple conformations of protein molecules immobilized by 1-pyrenebutanoic acid succinimidyl ester (PASE) linkers on graphene. The activation barrier between two bi-stable conformations exhibited by PASE is confirmed to be based on the steric hindrance effect between a hydrogen on the pyrene group and a hydrogen on the alkyl group of this molecule. Even after the protein is supplemented, this steric hindrance effect remains if the local structure of the linker consisting of an alkyl group and a pyrene group is maintained. Therefore, it is likely that the kinetic behavior of a protein immobilized with a single PASE linker exhibits an activation barrier-type energy surface between the bi-stable conformations on graphene. We discuss the expected protein sensors when this type of energy surface appears and provide a guideline for improving the sensitivity, especially as an oscillator-type biosensor.
  • Motoharu Kitatani, Shiro Sakai, Ryotaro Arita
    Physical Review B 2023年11月13日  査読有り筆頭著者責任著者
  • Motoharu Kitatani, Liang Si, Paul Worm, Jan M. Tomczak, Ryotaro Arita, Karsten Held
    Physical Review Letters 2023年4月20日  査読有り筆頭著者責任著者

MISC

 1

講演・口頭発表等

 13

共同研究・競争的資金等の研究課題

 5