Research

Keywords

• low-dimensional organic conductors
• scanning tunneling microscope (STM)
• scanning tunneling spectroscopy (STS)
• nonlinear conductivity
• the symmetry of Cooper pairs
• spin density wave(SDW)
• chiral superconductivity
• mesoscopic systems

Subject

• Mechanism of organic superconductors by Scanning Tunneling Spectroscopy (STS)
• STM/STS on a monolayer and nanotubes
• Spin density wave dynamics
• Topological quantum phenomena in chiral superconductors

Outline

We are studying about dynamics of spin density wave (SDW), symmetry of the pair wave function of in low dimensional super conductor, physics of electron in low dimensional conductor near metal-insulator transition, and so on by Scanning Tunneling Microscope/Spectroscopy (STM/STS), Nuclear Magneto Resonance (NMR), susceptibility, non-linear conduction, narrow band noise, magneto resistance, etc.

Recent Highlights

1. Fukuoka et al., Magnetic field induced insulator-to-metal Mott transition in λ-type organic conductors, Phys. Rev. B 109, 195142 (2024).
   https://doi.org/10.1103/physrevb.109.195142
2. Saito et al., Antiferromagnetic ordering and estimation of the exchange interaction in the π-d system λ-(BEDSe-TTF)2FeCl4 studied using 13CNMR, Phys. Rev. B 108, 155112 (2023).
   https://doi.org/10.1103/physrevb.105.134427
3. Fukuoka et al., 13C NMR study of the stabilization of the antiferromagnetic ground state and the emergence of unconventional magnetic state in a molecular π-d system, Phys. Rev. B 105, 134427 (2022).
   https://doi.org/10.1103/physrevb.105.134427
4. Taiga Kato, Hanming Ma, Kazuyoshi Yoshimi, Takahiro Misawa, Shigen Kumagai, Youhei Iida, Yoshiaki Sasaki, Masashi Sawada, Jun Gouchi, Takuya Kobayashi, Hiromi Taniguchi, Yoshiya Uwatoko, Hiroyasu Sato, Noriaki Matsunaga, Atsushi Kawamoto, Kazushige Nomura
   “Pressure-induced nearly perfect rectangular lattice and superconductivity in an organic molecular crystal (DMET-TTF)2AuBr2” https://arxiv.org/abs/2405.12086
5. Youhei Iida, Masashi Sawada, Yoshiaki Sasaki, Tomoaki Tsuchiya, Takaaki Minamidate, Noriaki Matsunaga, Atsushi Kawamoto, and Kazushige Nomura
   “Spin density wave in the strongly dimerized quasi-one-dimensional organic conductor (DMET-TTF)2AuBr2”
   Phys. Rev. B 104, 184409 (2021) 〔DOI: https://doi.org/10.1103/PhysRevB.104.184409〕
6. H. Nobukane, E. Uno, Y. Tabata, K. Takahashi, D. Sakabe, and S. Tanda,
   “Dynamics of liquid crystal vortex in a layered superconductor”,
   Phys. Rev. B 109, 174505 (2024) 〔DOI: https://doi.org/10.1103/PhysRevB.109.174505〕

Laboratory Website (Low Temperature Physics Group)

Laboratory Website (Electronic Properties of Low-dimensional Conductors Group)

Staff

• KAWAMOTO Atsushi

  Professor

  Emailatkawa(at)phys.sci.hokudai.ac.jp

  Office5-01-29
• 
  MATSUNAGA Noriaki

  Associate Professor

  Emailmat(at)phys.sci.hokudai.ac.jp

  Office5-01-27
• 
  FUKUOKA Shuhei

  Assistant Professor

  Emailfukuoka(at)phys.sci.hokudai.ac.jp

  Office5-01-20
• 
  NOBUKANE Hiroyoshi

  Assistant Professor

  Emailnobukane(at)sci.hokudai.ac.jp

  Office5-01-24
• 
  IHARA Yoshihiko

  Lecturer

  Emailyihara(at)phys.sci.hokudai.ac.jp

  Office5-01-28

Contact

ZIP Code　060-0810

Address　Kita 10, Nisi 8, Kita-ku, Sapporo 060-0810, JAPAN

TEL　+81(JPN)-11-706-4431

FAX　+81(JPN)-11-706-4926