Takeo TAKAGI
Professor, Department of Applied Physics, University of Fukui- Field of Specialty：
- Low temperature physics
- Topics of Research：
- (B01) Novel Edge Phenomena in Spin-Triplet Superfluids
- Specific Topics：
- Research and identification of novel states at a boundary and a vortex in the superfluid 3He
RESEARCH
From my graduate student days, I studied a behavior of order parameters of the Bose condensation of a helium system especially superfluid helium3, and superfluid helium4. I was especially interested in control of a texture of helium3 and identifying it by calculating of the NMR spectrum. Moreover, I studied the two-dimensional frustrated system of Ising spin which has the equivalent order parameter space to that of the superfluid helium4.
Calculations of a path integral and Green function Monte Carlo was also experienced based on the Monte Carlo calculation at that time. These two calculation methods are quite effective for helium system because of the simple particle interaction. Recently, the decomposition beyond the 2nd accuracy (Trotter formula) was discovered, and these two calculation methods using Monte Carlo technique have developed. Applying these methods to helium system is also planning in parallel.
In this project, we plan to detect the Intrinsic Angular Momentum of the superfluid helium3 A-phase. We confine the superfluid helium3-A phase in the rotation cylinder and observe a NMR resonance frequency. The Mermin-Ho structure of A phase which is realized in the cylinder is modulated by the rotation. The rotational dependence of NMR frequency tells us the IAM exists or not. The experiment of this system is carried out in ISSP of university of Tokyo.
EDUCATION
- 1981
- B.Sc. in Physics, Tohoku University
- 1983
- M.S. in Physics, Tohoku University
- 1985
- M.S. in Physics, Nagoya University
- 1988
- Ph.D in Physics, Nagoya University
PROFESSIONAL EXPERIENCE
- 1988-1989
- Research Associate, Department of Physics, Nagoya University
- 1989-1997
- Lecturer, Department of Applied Physics, University of Fukui
- 1997-2008
- Associate Professor, Department of Applied Physics, University of Fukui
- 2008-Present
- Professor, Department of Applied Physics, University of Fukui
SELECTION OF PUBLICATIONS
"Path Integral Calculation of 4He in Quasi-one-dimensional Channels",
H. Kiriyama, J. Taniguchi, M. Suzuki, T. Takagi,
J. Low Temp. Phys. 162, 597-602(2011)
"Spin Wave and Vortex Excitations of Superfluid 3He-A in Parallel-Plate Geometry",
M. Yamashita, K. Izumina, A. Matsubara, Y. Sasaki, O. Ishikawa, T. Takagi, M. Kubota, T. Mizusaki,
Phys. Rev. Lett. 101, 025302 (2008)
"Path Integral Calculation of 4He in Zero-Dimensional Nanocage Model",
Y. Nakamura, T. Takagi,
J. Phys. Soc. Jpn. 77, 03608-03614(2008)
"Vortex Formation and Annihilation in Three Textures of Rotating Superfluid 3He-A",
R.Ishiguro, O.Ishikawa, M.Yamashita, Y.Sasaki, K.Fukuda, M.Kubota, H.Ishimoto, R.E.Packard, T. Takagi, T.Ohmi, T.Mizusaki,
Phys. Rev. Lett. 93, 125301 (2004)
"New Partially Disordered Phases with Commensurate Spin Density Wave in Frustrated Triangular Lattice",
T. Takagi and M. Mekata,
J. Phys. Soc. Jpn. 64, 4609 -4627 (1995)
