Masanori Kohno

Masanori Kohno
Nano-System Organization Unit, Nano-System Organization Group
Condensed Matter Physics
Academic degree:
Ph.D., University of Tokyo
Recent publications
See NIMS Researchers DB
Home Page:
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Educational and Working History

2006 - Present Senior Researcher, National Institute for Materials Sciencee (NIMS)
2006 - 2007 Visiting Researcher, University of California, Santa Barbara
2003 Researcher, NIMS
1998 Researcher, Mitsubishi Research Institute, Inc.
1998 Ph.D., University of Tokyo

Research Interests

Fractional excitations in frustrated magnets in two-dimensions

He resolved a long-standing puzzle on the dynamical properties in frustrated two-dimensional antiferromagnet Cs2CuCl4 in terms of fractional excitations in collaboration with L. Balents and O. A. Starykh. Through this work, he showed that descendants of one-dimensional fractional excitations strongly persist in spatially anisotropic frustrated antiferromagnets, which provides a partial answer to the fundamental question in modern condensed matter physics on fractionalization in two dimensions in the absence of magnetic field.

Numerical simulations for spin systems and electronic systems

He applied large-scale quantum Monte Carlo techniques to various kinds of spin systems, and quantitatively explained a variety of magnetic properties in real materials, such as quantum critical behaviors in one-dimensional organic compounds and magnetic ordering in three-dimensional perovskite materials. Also, he applied numerical techniques to predict unconventional phases in strongly correlated electron systems.

Quantum phenomena caused by strong correlations in low-dimensional systems

He investigated quantum phenomena in strong correlated systems by numerical and analytical techniques. He proved the emergence of a ferromagnetic phase in the Hubbard model on a ladder in an extreme situation, and he confirmed the stability in a wider range of parameters by numerical simulations. Also, he predicted the emergence of superconductivity in strongly correlated electron systems by tuning band structures in collaboration with M. Imada.

Selected Papers

  1. Mott Transition in the Two-Dimensional Hubbard Model
    Kohno M
    Phys Rev Lett, 2012; 108(7): 076401.
  2. Spectral Properties near the Mott Transition in the One-Dimensional Hubbard Model
    Kohno M
    Phys Rev Lett, 2010; 105(10): 106402.
  3. Quasiparticles of spatially anisotropic triangular antiferromagnets in a magnetic field
    Kohno M
    Phys Rev Lett, 2009; 103(19): 197203.
  4. Dynamically dominant excitations of string solutions in the spin-1/2 antiferromagnetic Heisenberg chain in a magnetic field
    Kohno M
    Phys Rev Lett, 2009; 102(3): 037203.
  5. Spinons and triplons in spatially anisotropic frustrated antiferromagnets
    Kohno M, Starykh OA, Balents L
    Nat Phys, 2007; 3(11): 790-795.
  6. Low-temperature properties of the spin-1 antiferromagnetic Heisenberg chain with bond alternation
    Kohno M, Takahashi M, Hagiwara M
    Phys Rev B Condens Matter Mater Phys, 1998; 57(2): 1046-1051.
  7. Aspects of the ground state of the U=∞ Hubbard ladder
    Kohno M
    Phys Rev B Condens Matter Mater Phys, 1997; 56(23): 15015-15024.
  8. Ground-state properties of the two-dimensional t-J model
    Kohno M
    Phys Rev B Condens Matter Mater Phys, 1997; 55(14): 1435-1438.