RESEARCH

We have studied dynamics of electrons (spin and charge) in semiconductor nanostructures, such as quantum dots or quantum Hall devices. For quantum dots, we have successfully demonstrated quantum state control of single electron states or few-electron states for demonstrating semiconductor quantum bits. A high-speed charge detection scheme is developed for detecting charge states in quantum dots, which is actually applied to a single-electron ammeter. For quantum Hall devices, we have investigated high frequency transport through chiral edge states formed at the edges of quantum Hall regions.

In this project, we are planning to study intriguing behaviors of interacting electrons in the traditional topological system, such as non-equilibrium states associated with spin-charge separation in a Tomonaga-Luttinger liquid and fractional charge excitations in the fractional quantum Hall regime.

EDUCATION

1986

B.Sc. in Physics, Tokyo Institute of Technology

1988

M.S. in Physics, Tokyo Institute of Technology

1991

Ph.D. in Physics, Tokyo Institute of Technology

PROFESSIONAL EXPERIENCE

1991-2008

NTT Basic Research Laboratories

2008-2010

Professor at Research Center for Low Temperature Physics, Tokyo Institute of Technology

2010-Present

Professor at Department of Physics, Tokyo Institute of Technolog

HONORS AND AWARDS

2003

Sir Martin Wood Prize, Millenium Science Forum

2005

JSPS(Japan Society for the Promotion of Science) Prize

SELECTION OF PUBLICATIONS

"Long-lived binary tunneling spectrum in the quantum Hall Tomonaga-Luttinger liquid"
K. Washio, R. Nakazawa, M. Hashisaka, K. Muraki, Y. Tokura, and T. Fujisawa,
Physical Review B 93, 075304-1-11 (Feb. 2016).
DOI: 10.1103/PhysRevB.93.075304

"Shot-noise evidence of fractional quasiparticle creation in a local fractional quantum Hall state"
M. Hashisaka, T. Ota, K. Muraki, and T. Fujisawa,
Physical Review Letters 114, 056802-1-5 (Feb. 2015).
DOI: 10.1103/PhysRevLett.114.056802

"Fractionalized wave packets from an artificial Tomonaga–Luttinger liquid"
H. Kamata, N. Kumada, M. Hashisaka, K. Muraki & T. Fujisawa,
Nature Nanotechnology 9, 177–181 (Feb. 2014).
DOI: 10.1038/nnano.2013.312

"Plasmon transport in graphene investigated by time-resolved electrical measurements"
N. Kumada, S. Tanabe, H. Hibino, H. Kamata, M. Hashisaka, K. Muraki and T. Fujisawa,
Nature Communications 4, 1363-1-6 (Jan. 2013).
DOI: 10.1038/ncomms2353

"Voltage-controlled group velocity of edge magnetoplasmon in the quantum Hall regime"
H. Kamata, T. Ota, K. Muraki, and T. Fujisawa,
Physical Review B 81, 085329-1-5(Feb. 2010).
DOI: 10.1103/PhysRevB.81.085329

"Bidirectional counting of single electrons"
T. Fujisawa, R. Tomita, T. Hayashi, and Y. Hirayama,
Science 312, 1634-1-4 (Jun. 2006).
DOI: 10.1126/science.1126788

"Allowed and forbidden transitions in artificial hydrogen and helium atoms"
T. Fujisawa, D. G. Austing, Y. Tokura, Y. Hirayama, and S. Tarucha,
Nature 419, 278-1-4 (Jul. 2002).
DOI: 10.1038/nature00976

"Spontaneous Emission Spectrum in Double Quantum Dots"
T. Fujisawa, T. H. Oosterkamp, W. G. van der Wiel, B. W . Broer, R. Aguado, S. Tarucha, and L. P. Kouwenhoven,
Science 282, 932-1-5 (Oct. 1998).
DOI: 10.1126/science.282.5390.932