RESEARCH

I have been working on topological structures in Bose-Einstein condensates (BEC) of cold atomic gases. When the system has internal degrees of freedom, atoms are condensed into various phases which are characterized with different symmetries. In such a condensate, various types of topological excitations, such as vortices, monopoles, and skyrmions, can be accommodated. In my previous works, I have proposed an experimental scheme to produce and detect a new type of topological excitation, a knot, investigated the domain growth dynamics due to vortex-antivortex pair annihilation, and predicted the appearance of various vortex lattice structures in a spin-orbit coupled spinor BEC.

In this project, I investigate the topological band structure of the excitation spectrum from a BEC. Since the low-energy excitation band strongly depends on the condensate wave function, we expect that the topology of the excitation band can be changed by manipulating the condensate wave function. I will further investigate the dynamics after the topological phase transition triggered by the change in the condensate wave function.

EDUCATION

2005

Department of Physics, Kyoto University (Ph. D)

PROFESSIONAL EXPERIENCE

2005-2006

Ueda Group, Department of Physics, Tokyo Institute of Technology (Postdoc)

2007-2008

Ueda Group, Department of Physics, Tokyo Institute of Technology (Assistant Professor)

2008-2012

Ueda Group, Department of Physics, The University of Tokyo (Assistant Professor)

2012-2014

Department of Applied Physics and Quantum-Phase Electronics Center,
The University of Tokyo (Project Associate Professor)

2014-2015

Nagaosa Group, Department of Applied Physics, The University of Tokyo (Lecturer)

2015-Present

Tanaka Group, Department of Applied Physics, Graduate School of Engineering, Nagoya University (Associate Professor)

HONORS AND AWARDS

2008

Young Scientist Award of the Physical Society of Japan

2012

Inoue Resarch Award

2015

The Young Scientists' Prize, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

2017

21th Ryogo Kubo Memorial Prize (by Inoue Foundation for Science)

SELECTION OF PUBLICATIONS

"Spin Hall effect in a spinor dipolar Bose-Einstein condensate"
T. Oshima and Y. Kawaguchi
Physical Review A 93, 053605-1-10 (May. 2016)
DOI: 10.1103/PhysRevA.93.053605

"Skyrmionic magnetization configurations at chiral magnet/ferromagnet heterostructures"
Y. Kawaguchi, Y. Tanaka, and N. Nagaosa
Physical Review B 93, 064416-1-15 (Feb. 2016)
DOI: 10.1103/PhysRevB.93.064416

"Controlling and probing non-abelian emergent gauge potentials in spinor Bose-Fermi mixtures"
N. T. Phuc, G. Tatara, Y. Kawaguchi, and M. Ueda
Nature Communications 6, 8135-1-8 (Sep. 2015)
DOI: 10.1038/ncomms9135

"Coarsening dynamics driven by vortex-antivortex annihilation in ferromagnetic Bose-Einstein condensates"
K. Kudo and Y. Kawaguchi
Physical Review A 91, 053609-1-8 (May. 2015)
DOI: 10.1103/PhysRevA.91.053609

"Goldstone-mode instability leading to fragmentation in a spinor Bose-Einstein condensate"
Y. Kawaguchi
Physical Review A 89, 033627-1-5 (Mar. 2014)
DOI: 10.1103/PhysRevA.89.033627

"Spinor Bose-Einstein Condensates"
Y. Kawaguchi and M. Ueda
Physics Reports 520, 253-381 (Nov. 2012)
DOI: 10.1016/j.physrep.2012.07.005

"Symmetry Classification of Spinor Bose-Einstein Condensates"
Y. Kawaguchi and M. Ueda
Physical Review A 84, 053616-1-19 (Nov. 2011)
DOI: 10.1103/PhysRevA.84.053616

"Collision Dynamics and Rung Formation of Non-Abelian Vortices"
M. Kobayashi, Y. Kawaguchi, M. Nitta, and M. Ueda
Physical Review Letters 103, 115301-1-4 (Oct. 2009)
DOI: 10.1103/PhysRevLett.103.115301

"Knots in a Spinor Bose-Einstein Condensate"
Y. Kawaguchi, M. Nitta, and M. Ueda
Physical Review Letters 100, 180403-1-4 (May. 2008)
DOI: 10.1103/PhysRevLett.100.180403

"Can Spinor Dipolar Effects be Observed in Bose-Einstein Condensates?"
Y. Kawaguchi, H. Saito, and M. Ueda
Physical Review Letters 98, 110406-1-4 (Mar. 2007), arXiv:cond-mat/0611131
DOI: 10.1103/PhysRevLett.98.110406

"Spontaneous Circulation in Ground-State Spinor Dipolar Bose-Einstein Condensates"
Y. Kawaguchi, H. Saito, and M. Ueda
Physical Review Letters 97, 130404-1-4 (Sep. 2006), arXiv:cond-mat/0606288
DOI: 10.1103/PhysRevLett.97.130404

"Einstein-de Haas Effect in Dipolar Bose-Einstein Condensates"
Y. Kawaguchi, H. Saito, and M. Ueda
Physical Review Letters 96, 080405-1-4 (Mar. 2006), arXiv:cond-mat/0511052
DOI: 10.1103/PhysRevLett.96.080405

"Splitting instability of a multiply charged vortex in a Bose-Einstein condensate"
Y. Kawaguchi and T. Ohmi
Physical Review A 70, 043610-1-7 (Oct. 2004)
DOI: 10.1103/PhysRevA.70.043610