Ozawa group, AIMR, Tohoku University

Welcome to Ozawa group at Advanced Institute for Materials Research (AIMR) in Tohoku University!
We are a theoretical physics research group, studying an intersection between condensed matter physics and atomic, molecular, and optical physics.

The group in April, 2023
You can also see the group photo of April 2022.

What's new

August 28, 2023: Our works on quantum metric in Chern insulators are highlighted in the website of the institute! Two-dimensional Chern insulators: Expanding perspectives towards graphene
August 25, 2023: Collaboration with Urbana and Birmingham groups on the measurement of non-Hermitian adiabatic complex Berry phase is now published in Physical Review Research! Phys. Rev. Research 5, L032026 (2023)
August 12, 2023: Paper on topological Stiefel-Whitney and Euler insulators is published in Physical Review B! Phys. Rev. B 108, 075129 (2023)
August 1, 2023: Collaboration with an experimental group in Chili on topological waveguide lattices is published in APL Photonics! APL Photonics 8, 080801 (2023)
July 29, 2023: Experimental collaboration with Urbana and Birmingham groups on mechanical metamaterial is published in Physical Review A! Phys. Rev. A 108, 012221 (2023)
July 28, 2023: Together with Tomoya Hayata from Keio University, we wrote a paper on two-dimensional lattices with an imaginary magnetic field. The paper is on arXiv now! arXiv:2307.14635
July 20, 2023: Together with Päivi Törmä and Grazia Salerno from Aalto University, we studied relations between superfluidity and many-body quantum metric in one-dimensional Bose systems. The paper is now on arXiv! arXiv:2307.10012
July 7, 2023: We studied properties of a discrete nonlinear Schrödinger equation coupled to density-dependent gauge field. The paper is now on arXiv! arXiv:2307.02952
June 27, 2023: Enrico's paper (collaboration with Illinois and Birmingham groups) on nonlinear dynamics of non-Hermitian dimers is published in Physical Review E! Phys. Rev. E 107, 064211 (2023)
June 16, 2023: Ryo's collaboration paper on non-Hermitian skin effect under nonsymmorphic symmetries is now on arXiv! arXiv:2306.08923
May 4, 2023: Tomoki becomes an inaugural 2023 Fellow of the Asian Young Scientist Fellowship!
April 30, 2023: Bruno left the group to become Junior Researcher with FCT CEEC grant at Instituto de Telecomunicações in Lisbon, Portugal!
April 17, 2023: We investigated the bulk-edge correspondence of Stiefel-Whitney and Euler insulators through entanglement spectrum. The paper is now on arXiv! arXiv:2304.06974
April 4, 2023: We proved uniqueness of the lowest Landau level. If you are curious what this means, check out our paper on arXiv! arXiv:2304.00866
April 3, 2023: Sana joined as a new secretary of our group!
February 8, 2023: Enrico's paper on nonlinear dynamics of a non-Hermitian system is now on arXiv! arXiv:2302.03572
January 13, 2023: Collaboration with an experimental group in Chili on topological waveguide lattices is now on arXiv! arXiv:2301.04189
January 5, 2023: Tomoki joined the Editorial Board of Physical Review A!
December 21, 2022: Our paper on singular connection approach to resonant optical responses is published in Physical Review B! Phys. Rev. B 106, 245134 (2022)
December 13, 2022: Bruno's paper on Laughlin states under strong geometry deformation is published in Communications in Mathematical Physics! Commun. Math. Phys. (2022)
November 3, 2022: Bruno's paper on quantum metric of degenerate bands is published in Physical Review B! Phys. Rev. B 106, 165133 (2022)
October 26, 2022: Ryo's collaboration paper on surface plasmon is now on arXiv! arXiv:2210.13637
October 25, 2022: We proposed a model in which non-Hermitian topological energy spectrum is induced by inter-particle interactions, and the paper is now published in Physical Review Letters! Phys. Rev. Lett. 129, 180401 (2022)
October 14, 2022: A paper in which we propose a connection alternative to the Berry connection, which we call the singular connection, is now on arXiv! We discuss its relation to optical transitions and the shift vector. arXiv:2210.06844
October 11, 2022: Enrico joined the group as a Visiting Scientist. He is a PhD student from the University of Birmingham. Welcome, Enrico!
October 4, 2022: Bruno's new paper on information geometry is published in Physical Review B! Phys. Rev. B 106, 155101 (2022)
June 2, 2022: Bruno's collaboration paper with experimentalists on topology and quantum metrology is on arXiv! arXiv:2206.00546
May 20, 2022: Bruno's paper on the model complexity in statistical manifolds is published in IEEE Transactions on Information Theory!
May 20, 2022: A paper on band structures under periodic non-Hermitian potentials is publisihed in Physical Review B! Phys. Rev. B 105, 174108 (2022)
May 18, 2022: Bruno's new paper on quantum metric of degenerate bands is now on arXiv: arXiv:2205.07900
May 12, 2022: A paper on measurement of Quantum Fisher information is published in npj Quantum Information. The experiment is done in Huazhong University of Science and Technology.
May 6, 2022: A paper on the measurement of the adiabatic non-Hermitian Berry phase is now on arXiv! This work is a collaboration with Gadway group from UIUC and Price group from Birmingham. arXiv:2205.02700
April 18, 2022: Research of the group is featured in this month's issue of a Japanese magazine Yano E plus.
April 1, 2022: Ryo and Greta joined the group! Bill and Bruno finally arrived at Japan to properly join the group! Welcome all!
Here is the full member list of the group.
March 31, 2022: Ken left the group to become Postdoctoral Researcher at RIKEN!
March 2, 2022: New paper on band structures under periodic non-Hermitian potentials is on arXiv: arXiv:2203.00247
February 1, 2022: Bruno joined the group. Welcome Bruno!
January 31, 2022: Experimental collaboration on the realization of synthetic dimensions in silicon photonics has been published in Science Advances!
Press Release from Universities (in Japanese): Yokohama National University; Tohoku University; University of Tokyo; Keio University
Press Release in Other Media: EurekAlert!; Phys.org; SciTechDaily; Copernical; Nanowerk; Tech Explorist, etc...
Related Media Coverage: VICE
January 19, 2022: Tomoki contributed a section to "Roadmap on Topological Photonics" which is now on arXiv, arXiv:2201.06315, and will be published in JPhys Photonics!
December 6, 2021: Ken's collaboration paper with Kyoto University on quantum walk is on arXiv: arXiv:2112.03167
November 15, 2021: Ken's paper is published in Phys. Rev. Research as Editor's Suggestion! Phys. Rev. Research 3, 043112 (2021)
September 28, 2021: A paper "Engineering geometrically flat Chern bands with Fubini-Study Kähler structure" with Bruno Mera is published in Physical Review B!
September 21, 2021: Tomoki wrote an article for Suri-Joshi, a website for promoting women in mathematics. "Mathematics and Physics -- Topology and Insulators and My Research Life (in Japanese)"
September 1, 2021: Bill joined the group. Welcome Bill!
August 3, 2021: Ken's new paper on nonlinear Floquet topological edge states is on arXiv: arXiv:2108.00649
July 21, 2021: Collaboration with Gadway group at the University of Illinois and Price group from Birmingham on synthetic mechanical lattices is now on arXiv: arXiv:2107.09649
July 20, 2021: New paper with Bruno Mera on Chern insulators and quantum geometry is on arXiv: arXiv:2107.09039
July 2, 2021: Two papers on Chern insulators and the quantum volume are published in Physical Review B!
Phys. Rev. B 104, 045103 (2021) and Phys. Rev. B 104, 045104 (2021)
May 31, 2021: New paper on realization of a synthetic dimension in a silicon ring-resonator is now on arXiv: arXiv:2105.13742. This is an experimental work done in collaboration with Yokohama National University and the University of Tokyo.
May 19, 2021: Tomoki is now Tohoku University Distinguished Researcher!
May 4, 2021: A paper on topological laser published in APL Photonics
April 6, 2021: Tomoki receives The Young Scientists' Award, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology!
April 1, 2021: Ken joined the group. Welcome Ken!
March 31, 2021: Feature Issue on Photonic Topological Materials in Optical Materials Express, in which Tomoki served as a guest editor, has been published online!
March 23, 2021: Two new papers about Chern insulators and the quantum volume are now on arXiv: arXiv:2103.11582 and arXiv:2103.11583
March 19, 2021: Tomoki's paper Artificial magnetic field for synthetic quantum matter without dynamical modulation has been published in Physical Review A! The paper is open access!
March 12, 2021: Tomoki receives 15th (2021) Young Scientist Award of the Physical Society of Japan (Division 1)!
January 14, 2021: Research of Tomoki has been featured in an Israeli popular magazine "Epoch". Here is a link to a related news article from AIMR.
January 2021: New website launched!
February 2020: The group was born!

Ozawa Group

Ozawa Group

What's new