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.
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: Collaboration with Illinois and Birmingham groups 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
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: 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 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
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
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.
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