Host: Takashi Kumagai

Understanding Correlation Among Electron-Phonon-Spin Degree of Freedom in Advanced Molecular Optoelectronics

  • IMS-FHI Joint Online Seminar
  • Date: Jul 4, 2022
  • Time: 10:00 AM (Local Time Germany)
  • Speaker: Kiyoshi Miyata
  • Department of Chemistry, Kyushu University
  • Host: Takashi Kumagai
Microscopic understanding of exciton and carrier physics in molecular materials for optoelectronics is a great challenge because of their complexity resulting from strong electron-phonon coupling and perhaps interaction to spin degree of freedom; [more]

Near-field Optical Microscopy and its Recent Advances: High Speed Imaging and Broadband Measurements

Near-field optical microscopy (aperture-less type) enables optical analysis and imaging with the nanoscale spatial resolution owing to light field localized at a nanometric volume at a plasmonic tip apex. It has been recognized as a powerful analytical technique for a few decades since its invention, and has still shown tremendous progress, contributing to a wide variety of scientific fields. Its spatial resolution, for example, has been drastically improved in recent years, which now goes down to the single molecular level. [more]

Atomically-resolved interlayer charge ordering and its interplay with superconductivity in YBa2Cu3O6.81

  • Joint Seminar
  • Date: Nov 8, 2021
  • Time: 09:00 AM (Local Time Germany)
  • Speaker: Prof. Ya-Ping Chiu
  • Department of Physics, National Taiwan University, Taipei, Taiwan
  • Host: Takashi Kumagai
Joint seminar of Fritz Haber Institute and Institute for Molecular Science, Japan. Charge order (CO) has been recognized as one of the most important competing order in superconductive cuprates. In YBa2Cu3O6+x (YBCO), CO could only be investigated by x-ray diffraction in under-doped YBCO with low critical temperatures (TC), but not in highly-doped YBCO with high TC suitable for device applications, due to the competing superconductive phase. Therefore, the most fundamental physical mechanisms governing CO, for example, the role of so-called charge reservoir (Cu-O chain) layers in CO and the spatial interplay of CO and SC, in highly-doped YBCO are still unclear. [more]

Engineering pi-conjugated nanomaterials on surfaces

Joint seminar of Fritz Haber Institute and Institute for Molecular Science, Japan. The design of pi-conjugated nanomaterials is at the vanguard of science and technology taking into account the interest in optoelectronics,nanomagnetism, quantum information and non-trivial quantum phases of matter.In this talk I will revise our efforts in the last couple of years to engineer on surfaces pi-conjugated polymers and networks that could expressnon-trivial topological quantum classes. [more]

Soft X-ray Photoelectron Momentum Microscopy: resonating valence band element selectively

  • Joint Seminar
  • Date: Jun 7, 2021
  • Time: 10:00 AM (Local Time Germany)
  • Speaker: Dr. Fumihiko Matsui
  • UVSOR synchrotron facility, Institute for Molecular Science, Japan
  • Host: Takashi Kumagai
Joint seminar of Fritz Haber Institute and Institute for Molecular Science, Japan. Photoelectron micro-spectroscopy and spectro-microscopy are important approaches for elucidating the local electronic properties of micro- and nano-structures. By combining the photoelectron momentum microscope (PMM) and a soft X-ray synchrotron radiation, three-dimensional momentum-resolved photoelectron spectroscopy with a microscopic field of view is realized. [more]
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