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Hasegawa Lab
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A lab that develops microscopes tracing surfaces with a needle to observe the world at the scale of single atoms.
AboutAbout the lab
Seeing atoms and magnetism with a needle tip.
The Hasegawa Lab uses scanning tunneling microscopy and atomic force microscopy to study material surfaces at the atomic scale.
A sharp needle is brought extremely close to a surface, and the tunneling current that flows is used to measure surface topography and electronic states.
The lab works on two-dimensional superconductivity at surfaces, unconventional superconductivity, the magnetic structure of magnetic thin films, and measurement of spin flow.
The lab also puts great effort into developing microscopes that operate in special environments, such as ultralow temperatures, strong magnetic fields, and under microwave irradiation.
Key terms
- Scanning tunneling microscope
- A microscope that brings a fine needle close to a sample surface and turns the faint current that flows into an image of the atomic-scale bumps and dips
- Tunneling spectroscopy
- A measurement method that examines the electronic states directly beneath the needle as changes in current while the voltage is varied
- Spin-polarized STM
- A technique that uses a needle with magnetic properties to distinguish the direction of magnetization on a surface at the atomic scale
NewsLab news
Assistant Professor Haze received the Lecture Encouragement Award from the Japan Society of Vacuum and Surface Science
Published a paper on observing vortices in the anomalous metal state of a single-atomic-layer superconductor
Published a paper on scanning tunneling potentiometry at low temperatures
Assistant Professor Haze received the Young Scientist Award from the Physical Society of Japan
Published a paper in which a doctoral student carried out everything from sample synthesis to measurement
ResearchResearch themes
Using scanning tunneling microscopy, the lab reveals what happens on material surfaces at the nanometer scale. It is committed to high-precision measurements under special conditions, such as low temperatures, magnetic fields, and high-frequency irradiation.
*Illustrative imageNanoscale Superconductors
The lab deposits lead onto silicon substrates to create island structures and monolayer superconducting thin films, and measures their superconducting properties with tunneling spectroscopy. It investigates differences due to size and shape, how magnetic flux penetrates in a magnetic field, and related questions.
*Illustrative imageMagnetic Thin Films on Heavy Elements
In magnetic thin films grown on substrates of heavy elements, the Dzyaloshinskii-Moriya interaction gives rise to complex magnetic structures. The lab studies these magnetic structures and their excited states using spin-polarized STM.
*Illustrative imageUnconventional Superconductivity Coexisting with Magnetism
The target is unconventional superconductors that coexist with magnetism and cannot be explained by conventional theory (BCS theory). Using an ultralow-temperature, ultrahigh-vacuum STM, the lab maps tunneling spectra across the surface to study their properties and how they relate to magnetism.
*Illustrative imageMeasuring Electrical Flow on Surfaces
The lab studies electrical conduction on surfaces using scanning tunneling potentiometry, which measures the distribution of electric potential on a surface with high precision. By combining it with spin-polarized STM, it also aims to measure the distribution of spin currents.
MembersFaculty
The members of the Hasegawa Lab consist of faculty, researchers, specialized technical staff, administrative assistants, and doctoral and master's students.As of 2025
- ProfessorYukio HasegawaPublications ↗
- Assistant ProfessorMasahiro HazePublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Scanning tunneling microscope (STM) 250 nm by 250 nm image of one-atom-thick silver islands grown on palladium (111) surface” Ponor / CC BY-SA 4.0 (cropped)
- Nanoscale Superconductors: “Quantum Physics; Nanoscale Devices ( )” National Institute of Standards and Technology / Public domain (cropped)
- Magnetic Thin Films on Heavy Elements: “Neel skyrmion coneplot” Forschungszentrum Jülich / CC BY 4.0 (cropped)
- Unconventional Superconductivity Coexisting with Magnetism: “Iron-based superconductor ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Measuring Electrical Flow on Surfaces: “4pp-dipole” Bert Voigtlaender / CC BY-SA 4.0 (cropped)
- Related lab (Fukutani Lab): “Photoemission laboratory” Food95 / CC BY-SA 4.0 (cropped)
- Related lab (Ideue Lab): “Graphen” AlexanderAlUS / CC BY-SA 3.0 (cropped)
- Related lab (Nishihaya Lab): “Molecular-beam epitaxy system at LAAS 0511” Guillaume Paumier (user:guillom) / CC BY-SA 3.0 (cropped)
- Related lab (Yoshimi Lab): “Molecular Beam Epitaxy System” SJMW1987 / CC BY 4.0 (cropped)
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