CV

日本語/English

Yusuke Iguchi, Ph.D.

Pronunciation [yoo-sooh-keh ee-gooh-chee]

Contact

Senior Research Scientist-Physical
Geballe Laboratory for Advanced Materials, Stanford University
476 Lomita Mall, McCullough Room 137, Stanford, CA 94305, USA 
email: yiguchi(at)stanford.edu

Education

PhD & MS, Department of Basic Science, The University of Tokyo, Tokyo (2018) 
                                                                               (Advisor: Yoshinori Onose)
BS, Department of Physics, Tokyo university of Science, Tokyo (2013)
                                                                                 (Advisor: Setsuo Mitsuda)

Employment history/work experience

2020 - current  Senior Research Scientist-Physical, Geballe Laboratory for Advanced 
                          Materials, Stanford University
2018 - 2020      Postdoctoral Research Fellow, Department of Applied Physics, 
                          Stanford University (Advisor: Kathryn Ann Moler)
2018 - 2020      Japan Society for the Promotion of Science Overseas Research Fellow
2016 - 2018       Research Fellow (DC2) of Japan Society for the Promotion of Science 

Honors and Awards

2018/4      Overseas Research Fellowship of Japan Society for the Promotion of Science
2017/1       Journal of Physical Society of Japan Papers of Editors' Choice
2016/4      Research Fellowship (DC2) of Japan Society for the Promotion of Science
2015/3      Incentive award, Graduate School of Arts and Sciences, University of Tokyo

Selected Papers (All papers are here)

  1. Y. Iguchi, I. P. Zhang, E. D. Bauer, F. Ronning, J. R. Kirtley, K. A. Moler
    Local observation of linear-T superfluid density and anomalous vortex dynamics in URu2Si2
    Physical Review B 103, L220503 (2021)

  2. Y. Iguchi, Y. Nii, M. Kawano, H. Murakawa, N. Hanasaki, and Y. Onose
    Microwave non-reciprocity of magnon excitations in a non-centrosymmetric antiferromagnet Ba2MnGe2O7
    Physical Review B 98, 064416 (2018)

  3. Y. Iguchi, Y. Nii, and Y. Onose
    Magnetoelectrical control of nonreciprocal microwave response in a multiferroic helimagnet
    Nature Communications 8, 15252 (2017)
  4. Y. Iguchi, S. Uemura, K. Ueno, and Y. Onose
    Nonreciprocal magnon propagation in a noncentrosymmetric ferromagnet LiFe5O8
    Physical Review B 92, 184419 (2015) 

Experimental skills

Measurements
Synchrotron X-Ray diffraction
Microwave spectroscopy(Low temperature Microwave broadband measurement in magnetic field/Design of microwave circuit/
Micro Fabrication of Microwave circuit by using Photo- and EB-lithography)
Scanning SQUID microscopy
Ultra-low temperature measurement (Cryogenic dilution cryostat, Liquid He3/He4 cryostat)
Uniaxial strain measurement (Mechanical uniaxial stress/Micro uniaxial stress by piezo)

Sample growth
Polycrystal growth (EB, Spattering, Resistance heating)
Single crystal growth (Floating zone, Flux)

Others
Programing (Perl, Python, MATLAB)
Equipment Remote Control (Lab view, MATLAB, Python)
Radioactive material treatment (URu2Si2,UTe2)

Area of Specialty

3. Study of local superconducting states in unconventional superconductors by using scanning SQUID Microscopy
Senior Research Scientist/Postdoc, Stanford University (2018-current):
I am working as a Senior Research Scientist at Stanford university in Moler group after I finished my postdoctoral scholar in 2018-2020. We newly launched the cryogenic dilution unit (BLUEFORS) and introduced the scanning SQUID microscope. We observed local linear-T superfluid density and anomalous vortex dynamics in URu2Si2.[Phys. Rev. B(Letter) 2021] We also observed the anisotropic vortex dynamics in the nematic superconductor FeSe at another cryogenic 4K cryostat (BLUEFORS).[Phys. Rev. B 2019] The observed vortex dynamics can be explained by our simulation with use of the toy model of the quadratic pinning potential.

2. Non-reciprocity of magnon excitations in non-centrosymmetric magnets
MS & PhD, University of Tokyo (2013-2018):
I am a first member of Onose Laboratory. We launched the 20 GHz microwave measurement system and implemented the creation of single crystal, the design of microwave antenna, and the micro-fabrication. We first observed the nonreciprocal microwave response via the asymmetric magnon-band in chiral system, which is denoted as the Rashba effect in magnon system.[Phys. Rev. B 2015] In addition, in the microwave measurement system, we observed the nonreciprocal propagation of surface acoustic wave (SAW) via the phonon-magnon coupling[Phys. Rev. B(Rapid Communications) 2017], and we electrically and magnetically controlled the nonreciprocal propagation of microwave in multiferroics.[Nat. Commun. 2017; J. Phys. Soc. Jpn.2017] In addition, we also designed the 40 GHz microwave measurement system. We succeeded in observing the nonreciprocal microwave propagation in antiferromagnetic multiferroics and quantitatively evaluating the nonreciprocity.[Phys. Rev. B 2018]

1. Uniaxial-Pressure Effects on Spin-Driven Lattice Distortions in Geometrically Frustrated Magnets
BS, Tokyo University of Science (2012):
We revealed that the lattice largely responds to a pressure near the phase transition point in CuFeO2, which has a strong spin-lattice correlation, by the measurement of Synchrotron radiation in uniaxial press.[J. Phys. Soc. Jpn. 2013]

Doctoral Dissertation

"Non-reciprocity of magnon excitations in non-centrosymmetric magnets" (doi/10.15083/00077865)