Researcher Information

Tatsuya Yanagisawa

Associate Professor

Ultrasonic Investigation of Electronic State in Solids

Department of Physics, Condensed Matter Physics

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Theme

1) Test for detection of augmented multipoles using composite field with electric current, lattice rotation and strains
2) Ultrasonic Investigation of Uranium Compounds without Local Inversion Symmetry
3) Ultrasonic Investigation of Composite Quantum Degrees of Freedom arise from High-symmetrical Cagelike Crystal Structure

FieldCondensed Matter Physics, Strongly Correlated Electron Systems, Low-temperature Physics
KeywordUltrasound, Very Low Temperature, High Magnetic Fields, Magnetism, Superconductivity, Rattling, Cage-structured Compounds, J-Material
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Representative Achievements

Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute non-Kramers System Y1-xPrxIr2Zn20
T. Yanagisawa, H. Hidaka, H. Amitsuka, S. Zherlitsyn, J. Wosnitza, Y. Yamane, and T. Onimaru
Phys. Rev. Lett. 123 (2019) 067201.
Search for multipolar instability in URu2Si2 studied by ultrasonic measurements under pulsed magnetic field'
T. Yanagisawa, S. Mombetsu, H. Hidaka, H. Amitsuka, P. T. Cong, S. Yasin, S. Zherlitsyn, J. Wosnitza, K. Huang, N. Kanchanavatee, M. Janoschek, M. B. Maple, and D. Aoki
Phys. Rev. B 97 (2018) 155137.
Evidence for a New Magnetoelectric Effect of Current-Induced Magnetization in a Toroidal Magnetic Ordered State of UNi4B'
Hiraku Saito, Kenta Uenishi, Naoyuki Miura, Chihiro Tabata, Hiroyuki Hidaka, Tatsuya Yanagisawa, and Hiroshi Amitsuka
J. Phys. Soc. Jpn. 87 (2018) 033702. (Editor's Choice)
Study of Localized Character of 4f Electrons and Ultrasonic Dispersions in SmOs4Sb12 by High-Pressure High-Frequency Ultrasonic Measurements'
S. Mombetsu, T. Murazumi, H. Hidaka, T. Yanagisawa, H. Amitsuka, P.-C. Ho, and M. B. Maple
Phys. Rev. B 94 (2016) 084152.
Gamma 3-type Lattice Instability and the Hidden Order of URu2Si2'
Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, and M. Brian Maple
J. Phys. Soc. Jpn. 82 (2013) 013601.
Academic degreePh. D.
Academic backgroundAssociate Professor, Hokkaido University 2012-present
Project Assistant Professor (Tenure Track), Hokkaido University 2008-2011
Postdoctral Scholar, Niigata University 2007
JSPS Postdoctral Fellow, University of California San Diego 2005-2006
JSPS Research Fellow, University of California San Diego 2004
Supervisor: Prof. M. Brian Maple
JSPS Research Fellow, Niigata University 2003
Affiliated academic societyThe Physical Society of Japan
ProjectJ-Physics: Physics of Conductive Multipole Systems

Department of Physics, Condensed Matter Physics

Tatsuya Yanagisawa

Associate Professor

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What is the research theme that you are currently focusing on?

I’ve been interested in a research regarding the physical phenomena, so called “Quadrupolar Kondo Effect”.
The Kondo effect is named after the Japanese physicist Dr. Jun Kondo, who has succeeded in explaining a bound state of conduction electrons and “magnetic” impurity in metals, theoretically in 1964. Now, the theory has been applied to the wide range of physical properties. In fact, not a day passes without hearing about the word “Kondo” in the laboratory of condensed matter physics all around the world. In 1980’s, the “(Electric) Quadrupolar Kondo Effect” as one higher rank of the (Magnetic) Kondo effect, is theoretically proposed by other theorists, however, direct experimental evidence has not been found. Recently, we firstly succeeded to observe a logarithmic temperature dependence of the quadrupolar response, which is theoretically predicted, in the rare-earth based metallic compounds by means of ultrasound at very low temperatures.
(DOI: 10.1103/PhysRevLett.123.067201)

Logarithmic temperature dependence of the quadrupolar susceptibility with Gamma 3 symmetry
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What made you decide to become a researcher?

For the root of my aspire to an experimental physicist, I was strongly influenced my father, who was filled with curiosity. He is not a researcher but just a self-employed and deal in selling and repairing vehicles in a small town. However, he was like an amateur inventor on the side. For example, he was operating an electric vehicle by using electric energy charging by a homemade wind power generator. He was also performing school visit at local elementary school regarding the wind power generator. In my childhood, I played with my father’s old personal computer PC-8001 (4 MHz processor!) and amateur radio, soldering iron, radio-control helicopter, and professional video camera and so on. Such childhood plays with gadgets are also useful for the present research.

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Please tell us what you think is good about your lab

I believe that new physics develops in the laboratory which has always developing apparatus. I am endeavoring to handmade special refrigerator for experiments in collaboration with excellent technicians in the machine shop of Dept. of Science. Because it saves the taxpayer’s money, and I believe that low-temperature techniques/skills as traditional craftwork arts need to be preserved like this way. Indeed, Dr. Heike Kamerlingh Onnes discovered superconductivity after he developed homemade helium liquefier and refrigerators, and then he got a Nobel prize in 1913. His motto “Door meten tot weten” (Knowledge through measurement) is also my favorite motto.

Graduate students and technicians are holding new handmade 3He cryostats at the machine shop.

 

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Please tell us about yourself; things you are good at, your favorites, hobbies, and daily routines.

When I was a postdoc in California, I happened to know the deep world of craft beer. Since then, visiting the microbrewery becomes one of my hobbies. When I visit to the research institutions in U.S. or Europe, I do enjoy local-beer tasting. I also love Japanese beer, my favorite is “Sapporo Classic (Furano Vintage)” in particular. It is my pleasure to tell my children how to pour a beer with golden ratio (7:3) and watching they are delighted to reproduce it.

Dr. Yanagisawa is smiling with unfiltered Pilsner at the underground beer cellar in Pilsen, Czech Republic.