Shintaro NOMURA
Associate Professor, Division of Physics, University of Tsukuba- Topics of Research：
- Optical study on real-space mappings of quantum Hall chiral edge states
■ Laboratory Website
■ Description of Research
[1137KB]
RESEARCH
The main research interest of my group is the physics of semiconductor nanostructures by spectroscopic methods at low temperatures. Our main research target has been focused to III-V compound semiconductors. Especially we are interested in phenomena due to the electron-electron and electron-hole interactions, such as Fermi edge singularities, enhancement of g-factors or mass, and fractional quantum Hall effects.
We have successfully developed a near-field scanning microscope system that can be operated at high magnetic field in a dilution refrigerator. We have successfully observed fine structures due to quantum Hall edge states near sample edges that shift inward with increase in magnetic field. We believe that our success in direct mapping of the quantum Hall edge states is a major step forward in nano-transport and nano-optics research and will contribute to image such as a fractional quantum-Hall phase and a quantum anomalous Hall phase.
In this project "Topological Quantum Phenomena in Condensed Matter with Broken Symmetries", we pursue novel phenomena originating from quantum Hall chiral edge states and reveal their topological aspects. Our project targets to imaging of spin resolved chiral edge states and spin injection to the edge states by making use of spectroscopic techniques including selective optical excitation by resonances, spin and orbital selection rules.
EDUCATION
- 1989
- B.Sc. in Physics, University of Tokyo (Advisors: Takayashi Kobayashi)
- 1991
- M.S. in Physics, University of Tokyo (Advisors: Takayashi Kobayashi)
- 1994
- Ph.D. in Physics, University of Tokyo (Advisors: Takayashi Kobayashi)
PROFESSIONAL EXPERIENCE
- 1994-1996
- Frontier Researcher, Nanoelectronics Materials Laboratory, The Institute of Physical and Chemical Research
- 1996-1999
- Research Scientist, Semiconductors Laboratory, The Institute of Physical and Chemical Research
- 1999-2012
- Associate Professor, Institute of Physics, University of Tsukuba
- 2005-2010
- Research Professor, NTT Basic Research Laboratories, NTT Corporation
- 2012-Present
- Associate Professor, Division of Physics, University of Tsukuba
SELECTION OF PUBLICATIONS
"Near-Field Optical Mapping of Quantum Hall Edge States",
H. Ito, K. Furuya, Y. Shibata, S. Kashiwaya, M. Yamaguchi, T. Akazaki, H. Tamura, Y. Ootuka, and S. Nomura,
Phys. Rev. Lett. 107, 256803-1-5 (Dec. 2011).
"Clear evidence of transition from nonlinear to linear screening of a two-dimensional electron system detected by photoluminescence spectroscopy",
M. Yamaguchi, S. Nomura, T. Maruyama, S. Miyashita, Y. Hirayama, H. Tamura, and T. Akazaki,
Phys. Rev. Lett. 101, 207401-1-4 (Nov. 2008).
"Optical probing of spin polarization of electrons in quantum dot edge channels",
S. Nomura, and Y. Aoyagi,
Phys. Rev. Lett. 93, 096803-1-4 (Aug. 2004)
"Near-field optical mapping of exciton wave functions in a GaAs quantum dot",
K. Matsuda, T. Saiki, S. Nomura, M. Mihara, Y. Aoyagi, S. Nair and H. Takagahara,
Phys. Rev. Lett. 91,177401-1-4 (Oct. 2003).
"Exciton-LO-phonon couplings in spherical semiconductor microcrystallites",
S. Nomura and T. Kobayashi,
Phys. Rev. B 45, 1305-1316 (Jan. 1992).
