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High-frequency
electron-spin manipulation in semiconductor artificial
atoms and molecules |
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Wilfred van
der Wiel
(Researcher , The University of Tokyo) |
| A coherent series of measurements
is aimed at focusing on high-frequency (GHz) electron-spin
manipulation in semiconductor few-electron quantum
dots. The motivation is formed by the fundamental
scientific importance of the study of electron spin
dynamics and the possible application of single-electron
spins as basic building blocks for quantum logic.
The main goals comprise the manipulation of a single-electron
spin in a quantum dot by a locally generated electron
spin resonance (ESR) field, measurement of a lower
bound for the single-electron spin decoherence time,
and the coupling of two electron spins in a double
quantum dot. |
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Ultrafast
switching by photo-induced cooperative phenomena in low
dimensional electronic structures with strong electron
correlation. |
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Shinichiro Iwai
(Associate Professor , Tohoku University) |
| Low dimensional electronic systems
sometimes show a photo-induced phase transition
(PIPT) which exhibits a drastic changes in optical,
dielectric and conducting properties. Ultrafast
switching phenomena in various electronic properties
driven by the photo-induced phase transition will
be investigated for low-dimensional Mott insulators
and chargetransfer complexes. Picosecond - femtosecond
switching caused by the cooperative interaction
in the photo-excited state will be found.
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Realization
of magnetization reversal by carrier-spin-injection into
nano-scale ferromagnetic alloy semiconductors. |
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Akira Oiwa
（Researcher, PRESTO, JST） |
| Magnetization reversal in ferromagnets,
which enables us to control and modulate the spin
states in solids, is one of the important techniques
to realize the novel spin devices. In order to develop
such spintronics devices in future, it is strongly
desired to establish the ways to manipulate the
magnetization orientation of ferromagnets without
using an applied magnetic field. This research aims
at realizing the magnetization reversal induced
by carrier-spin-injection in III-V based ferromagnetic
alloy semiconductors. In order to accomplish this,
carrier spins, which are strongly coupled with local
magnetic moments, are injected by optical or electrical
means in a magnetic single domain structure of nano-scale
ferromagnetic alloy semiconductors, and magnetization
rotation associated with the injection will be studied
in detail. |
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Synthesis
of a new polyhedral carbon nanomaterials and their functional
properties |
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Jun Onoe
（Associate Professor, Tokyo Institute of Technology）
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| Electron-beam irradiation of
solid C60 results in formation of a new polyhedral
carbon nanomaterials that exhibit a metallic property
in air at room temperature. The aim of the present
research project is to investigate the structure
and electronic properties of the new carbon nanomaterials
formed by a variety of carbon bond at nanoscopic
and macroscopic scales, and to apply them to functional
nanomaterials. |
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Advanced
control of sublattice-reversed heterostructure semiconductors |
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Takashi Kondo
(Associate Professor, The University of Tokyo) |
| Various physical properties
including quadratic nonlinear optical coefficients
are sign-reversed in sublattice-reversed semiconductor
crystals. In this project, we will develop the sublattice
reversal epitaxy technique as a well-established
versatile fundamental technology for growing a new
class of semiconductor heterosuructures of spatial
inversion. |
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Functional
integration of wide bandgap semiconductors for high-performance
power devices by controlling interface nanostructure |
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Jun Suda
(Lecturer , Kyoto University) |
| Wide bandgap semiconductors,
group-III nitrides (III-Ns) and silicon carbide
(SiC), are expected as key devices for information
technology and power technology. Functional integration
of III-Ns and SiC will realize novel high -performance
devices, which are not available individually. This
study intends to overcome the mismatch of chemical
bonding between the two materials by control of
atomic arrangements within "one atomic layer" at
the III-N/SiC interface, which contributes for functional
integration. |
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Self-Assembled
Alignment and Functionalization of Metal Ions in Artificial
DNAs |
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Kentaro Tanaka
(Associate Professor, The University of Tokyo) |
| DNA is a promising molercule
that provides a structural basis for the 'bottom
-up' fabrication of inorganic and bioorganic constituents.
Replacement of hydrogen-bonded base pairing of DNA
by metal-mediated base pairing could lead to "metallo-DNA"
in which metal ions are alined along the helix axis
in a controllable fashion. This research aims to
functionalize the artificial DNAs as molecular devices
such as molecular magnet, molecular wire and so
on. |
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Development
of solid-state quantum bits based on nuclear magnetic
resonance in quantum Hall systems |
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Tomoki Machida
(Associate Professor, The University of Tokyo) |
| Nuclear spin is an attractive
system for designing spintronics devices, e.g. quantum
bits, because of its extremely long decoherence
time. This project aims to study spin properties
of quantum Hall systems as well as to develop solid-state
nuclear-spin quantum bits based on quantum Hall
devices. |
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Wavefunction
imaging and control in semiconductor nano-structure by
ultimate optical nano-probe |
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Kazunari Matsuda
(Associate Professor, Kyoto University )
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| The shape and spread of wavefunction
of an electron-hole pair (exciton) dominating the
optical properties in semiconductor have not been
observed in real-space. In this research project,
we will enhance the spatial resolution up to a level
of several-nm in near-field scanning optical microscope.
By using this "ultimate optical nano-probe", we
will make the realization of exciton wavefunction
image and control in semiconductor nano-structures,
which is based on quantum devices. |
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Internal
regenerative medicine by gene therapy based on a nano-scale
gene carrier |
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Masaya Yamamoto
(Instructor, Kyoto University) |
| Recently, regenerative medicine
has attracted much attention as an alternative to
conventional therapeutic strategies for chronic
diseases with fibrosis, such as liver fibrosis and
lung fibrosis, because of the current imperfect
medical treatments for complete recovery. This project
aims to develop a novel therapeutic medicine named
"Internal regenerative medicine" as a therapy for
chronic diseases with fibrosis based on a nano-scale
gene carrier using water-soluble polymers for targeting
gene transfection to a specific organ. |
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Development
of single-crystal TMR Devices for High-Density Magnetoresistive
Random Access Memoｒｙ |
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Shinji Yuasa
(Leader of spintronics group, National Institute of
Advanced Industrial Science and Technology) |
| Magnetoresistive Random Access
Memory (MRAM) with tunnel magnetoresistance (TMR)
devices is expected to become an ultimate memory
device having ideal features such as non-volatility,
high speed, and high density. The goal of this research
project is to develop high-performance TMR devices
for Gbit-scale MRAM by using half-metallic electrodes
and single crystal tunneling barriers. |
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