Current Research Areas

In our laboratory, material properties under extreme conditions are studied by utilizing computer simulation methods based on the theory of electronic state, the molecular dynamics, and the first-principle electronic state calculations. The word "first-principle" means solving fundamental equations which rule electrons with basic physical constants such as Planck constants and eliminating empirical parameters. The importance of the first-principle calculation is that it can be applied to the system such as extremely high-pressure condition, complicated bulk surface/interface state, and nanostructures where experimental observations are difficult or sufficient information cannot be obtained by experiments.

Here, recent principal research topics are introduced aiming at undergraduate students.

Development of Calculation Methodologies

Sturcture Optimization
Structural exploration over saddle points of the potential-energy surface

Optical Processes in Solids

Excitonic complexes in diamond. We showed the stability of complexes circled by solid lines by numerical calculations.


Electron carriers doped in a barium titanate

Physics of Hydrogen in Solids

Quantum Distributions of Muon in Muonium State in Crystalline Silicon
Phys. Rev. Lett. 81, 1873-1876 (1998).


Gap function of MgB2
Gap function of MgB2


Interface structure of Nd magnet

Thermal Conductivity

Lattice thermal conductivity calculation with NEMD
Thermal Conductivity Calculation with Non-Equilibrium Molecular Dynamics

Surface and Interface Science

  • Electronic and spin properties at metal-semiconductor interfaces
Spin-polarized state at a nitride-boride interface
Spin-polarized wave function at the AlN/MgB2 interface
Phys. Rev. Lett. 106, 047201 (2011).

High-Pressure Physics

Nuclei distribution of solid hydrogen under high pressure
Nature 404, 259-262 (2000).