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Nishiguchi Lab
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A lab that measures the motion of a single electron and puts fluctuations to use in electronic devices.
AboutAbout the lab
Harnessing fluctuations for future electronic devices
Nishiguchi Lab (Nonequilibrium Electron Systems Lab) studies electron systems in nonequilibrium states, focusing on regimes where fluctuations and discreteness become essential to device operation.
Observing and controlling the motion of electrons in nanometer-scale devices, the lab aims to uncover new physical principles and create future electronic functions.
A distinctive feature of the lab is that device fabrication, precise measurement, and simulation are pursued together to directly observe and control nonequilibrium states inside actual devices.
The lab is recruiting students interested in nanodevices, transistors, and semiconductor physics, and lab visits are accepted at any time.
Key terms
- Nonequilibrium state
- A state in which an electronic device is kept running by continuously supplying energy so that it can carry and control signals
- Single-electron counting statistics
- A method that counts the number of electrons passing through a device in a given time to investigate the stochastic nature of electron transport
- Stochastic thermodynamics
- Thermodynamics that examines quantities such as entropy production based on the stochastic motion of electrons
- Stochastic pump
- A mechanism that uses periodic modulation of parameters and thermal fluctuations to produce directional transport without relying on an energy gradient
NewsLab news
Results of a collaborative study were published in Physical Review Research
Nishiguchi Lab was established
ResearchResearch themes
Using the fluctuations and discreteness of electrons in nonequilibrium states as clues, the lab investigates electron motion in nanoscale transistors and other devices. Building on room-temperature single-electron measurement technology, it works on controlling and verifying nonequilibrium phenomena.
*Illustrative imageSingle-Electron Counting Statistics
Using nanometer-scale transistors, the lab counts the number of electrons passing through a device to investigate the stochastic nature of electron transport. By focusing on the motion of many electrons at room temperature, it aims to deepen the understanding of stochastic thermodynamics.
*Illustrative imageDecomposing Energy Consumption in Devices
The lab divides the energy consumption of electronic devices into the portion that is essentially necessary and the avoidable loss, and investigates their physical origins. Based on the understanding gained, it aims to present design guidelines for optimal driving methods.
Stochastic Pumps and Information Transport
The lab takes on the experimental demonstration of stochastic pumps, which produce directional transport through the geometric phase from periodic modulation of parameters together with thermal fluctuations. It does so by precisely controlling single-electron fluctuations in nanoscale devices.
Stochastic Resonance in Single-Electron Systems
The lab investigates whether stochastic resonance, in which adding noise actually improves signal detection, also holds in discrete single-electron systems. By clarifying the behavior in single-electron circuits through experiments, it explores whether new physics emerges.
MembersFaculty
The members of Nishiguchi Lab are faculty and undergraduate students.As of 2026
- ProfessorKatsuhiko Nishiguchi
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: “Quantum dots demonstration set” Physicsexperimentsorg / CC BY-SA 4.0 (cropped)
- Single-Electron Counting Statistics: “Single electron transistor scheme” W2raphael / Public domain (cropped)
- Decomposing Energy Consumption in Devices: “Transistors.agr” ArnoldReinhold / CC BY-SA 3.0 (cropped)
- Related lab (Yamanashi Lab (Superconducting Quantum Integrated Electronics Lab)): “Noiseless Amplifier ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Sekiguchi Lab (Spintronics Lab)): “Scanning tunneling microscope; Semiconductor; Spintronics ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Obara Lab (Power Electronics Lab)): “Inverter Fronius = Sunways NT 6000-01ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Related lab (Oya Lab (Integrated Nanodevices Lab)): “Belousov-Zhabotinsky reaction” Wiktor (Uncle Azane) / CC BY-SA 3.0 (cropped)
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