Research topics
- Atomic layer materials are a type of layered material where the layers are bonded by weak van der Waals forces, allowing for the relatively simple extraction of single atomic layer thin films using tape. Due to their 2D nature, single and few-layer atomic materials exhibit properties completely different from their 3D counterparts. Furthermore, by stacking multiple atomic layer materials, a vast combination of heterostructures can be conceived, holding the potential for novel physical properties that are orders of magnitude beyond those of 3D crystals.
- We fabricate devices and heterostructures of atomic layer materials and explore new physical phenomena using electrical transport and optical measurements.
Below are examples of our recent research topics, but there are surely many new phenomena yet to be discovered by anyone in the world. We welcome those who are interested in exploring such novel properties and interesting functionalities with us, and those who are interested in the new wave of materials science.
Lab tours and questions are always welcome!
Pioneering Novel Physical Properties by Freely Controlling the Symmetry and Quantum Degrees of Freedom of Atomic Layer Materials
The fascinating aspects of atomic layer materials as seen from various transport characteristics.
Transport characteristics are frequently measured to determine the physical properties of atomic layer materials. Understanding how carriers such as electrons behave is crucial, whether in bulk or 2D materials.
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Quantum Hall Effect
Taking advantage of their extreme thinness, atomic layer materials are used as platforms for various physical property studies.
The quantum Hall effect is a famous example, where applying a magnetic field to a 2D electron system like graphene allows for the observation of a quantized Hall resistance.
Pioneering physical properties that leverage such low-dimensionality is an important area of research. -
Tunneling Magnetoresistance Effect
The phenomenon where the resistance of certain magnetic materials (like antiferromagnets) changes in response to an external magnetic field is called the magnetoresistance effect.
In atomic layer materials, their thinness allows for the observation of the "tunneling magnetoresistance effect," where electrons are tunneled by applying a voltage from above and below, even in insulators, to observe this effect.
A variety of measurements utilizing light.
Complementing transport characteristics, another important measurement is optical measurement. The Ideue Lab has its own optical systems, enabling various measurements at low temperatures (below 10 K) and under magnetic fields (above 5 T).
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Raman Spectroscopy
Raman spectroscopy is a technique often used to determine the composition of materials constituting a crystal.
The data obtained from Raman spectroscopy changes not only with the crystal's composition but also with various phase transitions, such as structural and magnetic phase transitions, making it an indispensable tool in the study of optical properties. -
Second Harmonic Generation (SHG)
Second Harmonic Generation (SHG) is another important measurement. With SHG, it is possible to obtain signals corresponding to the symmetry of the material, and this "symmetry" is a very important keyword in the study of physical properties.
Measuring various physical quantities of materials as thin as the atomic level.
Measuring the quantum states and physical properties of thin and fine atomic layer materials is generally difficult, and it is necessary to devise new measurement methods by innovating device structures and measurement systems.
The Ideue Lab devises and researches new measurement methods by utilizing microfabrication techniques available at the Institute for Solid State Physics, such as electron beam lithography (EBL), sputtering, and etching, as well as microwave measurement technology.
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Spin Resonance of Magnetic Materials
We are devising and researching methods to measure spin dynamics at the ultimate thinness of a few atomic layers, such as through microwave spin resonance.
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Kinetic Inductance of Superconductors
In the superconducting state where resistance becomes zero, inductance measurement is useful for understanding the state of the material as an alternative to resistance measurement.
The Ideue Lab is researching the measurement of kinetic inductance using superconducting microwave resonators and its application to the measurement of atomic layer superconductors.
