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Emergent Phenomena Measurement Research Team
Tetsuo HANAGURI
Team Leader
Tetsuo HANAGURI (D.Eng.)
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Research Areas

We experimentally study electronic states behind emergent phenomena in electron systems, such as high-temperature superconductivity and topological quantum phenomena. For this purpose, we use scanning tunneling microscopes working under combined extreme conditions of very low temperature, high magnetic field and ultra-high vacuum. Modern scanning-tunneling-microscopy technology enables us to obtain a "map of the electronic state" with atomic-scale spatial resolution and energy resolution as high as micro electron volt. We will make and analyze the maps of various materials and try to establish the relationships between material properties and electronic states. We also aim to improve and functionalize the scanning tunneling microscope and pursue the development of novel measurement techniques to discover new emergent phenomena in condensed matter.

Research Subject

  1. Surface Dirac electrons in topological insulators
  2. Superconducting-gap structures of high-temperature superconductors
  3. Development of novel scanning-tunneling-microscopy techniques

Related links

  1. RIKEN Advanced Science Institute Website_Laboratories PageNew Window

List of Selected Publications

  1. Hanaguri, T., Kitagawa, K., Matsubayashi, K., Mazaki, Y., Uwatoko, Y., and Takagi. H.:
    "Scanning tunneling microscopy/spectroscopy of vortices in LiFeAs"
    Phys. Rev. B 85, 214505 (2012).
  2. Kohsaka, Y., Hanaguri, T., Azuma, M., Takano, M., Davis, J. C., and Takagi, H.:
    "Visualization of the emergence of the pseudogap state and the evolution to superconductivity in a lightly hole-doped Mott insulator"
    Nature Phys. 8, 534 (2012).
  3. Hanaguri, T., Igarashi, K., Kawamura, M., Takagi, H., and Sasagawa, T.:
    "Momentum-resolved Landau-level spectroscopy of Dirac surface state in Bi2Se3"
    Phys. Rev. B 82, 081305(R) (2010).
  4. Hanaguri, T., Niitaka, S., Kuroki, K., and Takagi, H.:
    "Unconventional s-Wave Superconductivity in Fe(Se,Te)"
    Science, 328, 474 (2010).
  5. Hanaguri, T., Kohsaka, Y., Ono, M., Maltseva, M., Coleman, P., Yamada, I., Azuma, M., Takano, M., Ohishi, K. and Takagi, H.:
    "Coherence Factors in a High-Tc Cuprate Probed by Quasi-particle Scattering off Vortices"
    Science 323, 923 (2009).
  6. Hanaguri, T., Kohsaka, Y., Davis, J. C., Lupien, C., Yamada, I. Azuma, M. Takano, M. Ohishi, K. Ono, M. and Takagi, H.:
    "Quasiparticle interference and superconducting gap in Ca2-xNaxCuO2Cl2"
    Nature Phys. 3, 865 (2007).
  7. Iwaya, K., Satow, S., Hanaguri, T., Shannon, N., Yoshida, Y., Ikeda, S. I., He, J. P., Kaneko, Y., Tokura, Y., Yamada, T. and Takagi, H.:
    "Local Tunneling Spectroscopy across a Metamagnetic Critical Point in the Bilayer Ruthenate Sr3Ru2O7"
    Phys. Rev. Lett. 99, 057208 (2007).
  8. Kohsaka, Y., Taylor, C., Fujita, K., Schmidt, A., Lupien, C., Hanaguri, T., Azuma, M., Takano, M., Eisaki, H., Takagi, H., Uchida S., and Davis, J. C.:
    "An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates"
    Science 315, 1380 (2007).
  9. Hanaguri, T.:
    "Development of high-field STM and its application to the study on magnetically-tuned criticality in Sr3Ru2O7"
    Journal of Physics: Conference Series 51, 514 (2006).
  10. Hanaguri, T., Lupien, C., Kohsaka, Y., Lee, D. -H., Azuma, M., Takano, M., Takagi, H., and Davis, J. C.:
    "A 'checkerboard' electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2"
    Nature, 430, 1001 (2004).

Members

Principal Investigator

Tetsuo HANAGURI
Team Leader
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