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Fujisawa Lab
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A quantum transport lab that studies the behavior of single electrons in semiconductor nanostructures.
AboutAbout the lab
Manipulating electrons in semiconductors one by one.
The Fujisawa Lab studies the behavior (dynamics) of electrons in semiconductor nanostructures.
By controlling electrons in artificially designed structures, the lab investigates the quantum ways in which electric current flows that are unique to low-dimensional electron systems.
The lab also aims to extend this work to nanotechnology and quantum information technology.
Newly assigned students first learn basic knowledge and experimental techniques through measurement training, and then choose their own research topics.
Key terms
- Quantum dot
- A tiny, nanometer-sized box-like structure that can confine just a few electrons. Also called an artificial atom.
- Quantum Hall effect
- A phenomenon in which, when a strong magnetic field is applied to electrons confined in a thin layer, the conductance takes only discrete values.
- Edge channel
- A path formed at the edge of a sample in a quantum Hall state, along which electrons flow in only one direction.
- Surface acoustic wave
- A wave that travels along the surface of a crystal. It is generated by applying a high-frequency voltage to comb-shaped electrodes.
NewsLab news
Student received the Student Excellent Presentation Award (Division 4) from the Physical Society of Japan
Paper from the lab published in Nature Communications
Researcher in the lab received the Young Scientist Award (Division 4) from the Physical Society of Japan
Assistant Professor Shinichi Kaneko joined the Fujisawa Lab
Paper published in JJAP
ResearchResearch themes
Using semiconductor nanostructures, the lab investigates how electrons move in artificially designed environments, aiming to clarify quantum transport phenomena unique to low-dimensional electron systems. The research is conducted as a collaboration with the Quantum Solid State Physics Research Group at NTT Basic Research Laboratories.
*Illustrative imageEdge Channels in the Quantum Hall Effect
In a two-dimensional electron system under a strong magnetic field, one-way channels (edge channels) form at the edge of the sample. The lab investigates plasmons, fractional charges, and other phenomena that appear there, using high-speed electrical pulses and noise measurements.
*Illustrative imageQuantum Dots and Phonons
Using comb-shaped electrodes, the lab generates sound waves that travel along a crystal surface (surface acoustic wave phonons) and directs them at quantum dots. By artificially manipulating the interaction between electrons and lattice vibrations, it is pioneering new ways to control electronic states.
*Illustrative imageSingle-Electron Dynamics
Quantum dots, in which the number of electrons can be controlled precisely, are also called artificial atoms. The lab controls and observes their electronic states at high speed, studying the behavior of single and few electrons and its potential for quantum computing.
MembersFaculty
The members of the Fujisawa Lab consist of faculty, doctoral students, master's students, and undergraduate students.As of 2026
- ProfessorToshimasa FujisawaPublications ↗
- Assistant ProfessorShinichi Kaneko
VoicesStudent voices
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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: “Dilution Fridge 008 16K” OJB Quantum / CC BY 4.0 (cropped)
- Edge Channels in the Quantum Hall Effect: “Roundabout interchange” Petar Milošević / CC BY-SA 4.0 (cropped)
- Quantum Dots and Phonons: “F1057 opened” Mister rf / CC BY-SA 4.0 (cropped)
- Single-Electron Dynamics: “Drop-impact” Roger McLassus / CC BY-SA 3.0 (cropped)
- Related lab (Uchida Lab): “Molecular Beam Epitaxy System” SJMW1987 / CC BY 4.0 (cropped)
- Related lab (Matsuo Lab): “Dilution Refrigerator ( )” UCL Mathematical & Physical Sciences from London, UK / CC BY 2.0 (cropped)
- Related lab (Suyama Lab): “Gravitational lensing in the galaxy cluster Abell 370 (captured by the Hubble Space Telescope)” NASA, ESA, the Hubble SM4 ERO Team and ST-ECF / CC BY 4.0 (cropped)
- Related lab (Pu Lab): “MoS2” Askar.syrlybekov / CC BY-SA 4.0 (cropped)
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