Graduate School of Science,
Department of Physics, Solid-State Quantum Transport Group
Here, we show the main research results obtained in Hirayama-group after Prof. Hirayama’s movement to Tohoku University at 2006. We will add new results and missing items in the future.
We have promoted researches on carrier interactions in semiconductors, especially putting emphasis on interaction with nuclear spins. We have developed highly-sensitive resistively-detected NMR based on electron spin / nuclear spin interactions atν=2/3 and applied this technique to various studies. The outline of these studies can be found in,
（ SpinInteractionTwoThird.pdf： 313 KB）
（ RDNMRprinciple.pdf： 349 KB）
The research results as an extension of these studies can be seen in,
（ Nucleardiffusion.pdf： 240 KB）
（ Dickesuper.pdf： 218 KB）
（ Opticalnuclearpol.pdf： 255 KB）
The nuclear polarization and detection can be achieved by using quantum Hall breakdown, too. We use this technique in,
to extend the measurable range in nuclear resonance experiments. The resistively-detected NMR (RDNMR) can be applied also for nanostructure such as quantum point contact (QPC). Examples are.
（ FundamentalFeatureAtNu=2.pdf： 159 KB）
Microscopic studies based on nanoprobe are also very important.
is an example of the output of such a research. We have promoted research on InSb systems as shown below,
（ InSbRDNMR.pdf： 366 KB）
（ RDNMRQPC.pdf： 366 KB）
（ InSbGatecontrol.pdf： 224 KB）
As a fundamental research of low-dimensional physics and nanostructure devices, we have the following outputs.
（ valleyfreedom.pdf： 226 KB）
（ QPChomepagever2.pdf： 253 KB）
The coherent characteristics of spin systems induced by a pulse sequence are interesting as a novel nuclear resonance technique.