Conduction electrons in organic conductors behave simultaneously as quantum waves and classical particles. Due to the dual nature of these electrons, molecular solids demonstrate a variety of unconventional properties. Our group is investigating the possibility of finding a ferroelectric material that is polarized by a change of electron distribution, using techniques such as IR-Raman spectroscopy, nonlinear optics, and thermo-electric measurements. The unusual macroscopic polarization resulting from electron ordering could pave the way for future applications of organic solids in fast-switching devices and opto-electronic transducers.

We study the growth of thin film of a compound semiconductor, and are investigating those fundamental physical and chemical characteristics. Moreover, we are investigating the characteristic of the quantum dot of a compound semiconductor ,and are studying the application to an electronics device.

Weakly interacting massive particles (WIMPs) are promising candidate for dark matter. Direct detection experiments of dark matter aim to detect nuclear recoil emitted by scattering of WIMPs and standard model particles. In directional dark matter detection, not only recoil energy but also direction of nuclear recoil are expected to be detected. It has the potential to give constraints on dark matter nature such as velocity distribution model. I theoretically study the possibility of the directional dark matter detection. My another interest is neutrino physics. Neutrino would be a hint to the Physics beyond the Standard Model as well as dark matter. I have constructed new theoretical models including both dark matter and neutrinos.

The spatial resolution of images observed by the ground-based astronomical telescope is limited because of the wavefront distortion suffered by the turbulence of the earth atmosphere. In order to overcome this problem, we are studying the adaptive optics and developing the astronomical instruments with adaptive optics, which corrects the wavefront distortion in real-time. The applications of this technology into biological and medical fields are also being studied.
In addition, we are studying the internal structure, physical condition, formation, and evolution of the active galactic nuclei, which are active objects emitting a huge energy from the very compact region by mass accretion into the super-massive black hole at the center of galaxy, observing them with time-variability monitoring, polarimetry, and adaptive optics.

The latest cosmological observations strongly suggest the surprising fact that the Universe is undergoing an accelerated expansion at two very different times, immediately after the birth of the Universe and at the present time. However, this fact is incompatible with the property that gravity is an attractive force. An interesting fact is that the latest observational results suggest that a modification of general relativity may be manifested in the very early and current Universe. I believe that the key to the search for essentially new observables is to observe the “Dark Ages” and “Cosmic Dawn”, in which information about the very early Universe is preserved. Through radio observations that can probe these epochs, I aim to unravel the detailed history of the Universe.

Our research interests span various quantum phenomena such as magnetism, superconductivity, and multipolar ordering in strongly-correlated electron systems, as well as Weyl fermion excitations in what are known as topological Weyl semimetals. The nuclear magnetic resonance (NMR) techniques we use are advantageous because they allow us to investigate microscopic electronic states on the laboratory scale.

We also have a keen interest in developing a mobile and easily reproducible NMR spectrometer by leveraging the latest radio frequency technologies.

We attempted to perform non-invasive breast cancer imaging using a reflection-type multipoint laser Doppler velocimeter to monitor blood flow. On day six after transplantation of cancer cells into mouse breast, we found that blood flow velocity in a blood vessel that extended into the tumor was increased compared to that in normal skin. The effect of carcinogenesis on blood flow over such a short period was shown using blood flow velocity imaging.

Topology is a field of mathematics to study the properties of objects under continuous deformations. The classification of objects by means of number of the holes (corresponding to the topological number) indicates that a doughnut is identical with a mag with genus g=1. In topological materials whose wave functions are characterized by the topological number, electrons can move at very high speed near the edges. In contrast to conventional metals, they are less affected by defects in the crystal and/or impurities. Thus topological materials have received interest as highly functional materials toward next-generation devices.
We focus on topological materials and clarify the fundamental and transport properties, in which theoretical techniques such as the many-body quantum theory and the first principles methods are being applied to those.