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.
November 22, 2023: We succeeded in characterizing the many-body localization using a geometrical property of quantum states called many-body quantum metric. You can read the paper on arXiv! arXiv:2311.12280
October 19, 2023: Tomoki attended "2023 Asian Young Scientist Fellowship Annual Conference" held at the University of Hong Kong to receive the Asian Young Scientist Fellowship as one of the 12 inaugural fellows. You can find an article on the event here: https://www.hku.hk/press/news_detail_26709.html
October 13, 2023: Collaboration with Aalto University on the relation between Drude weight and many-body quantum metric is now published in Physical Review B as a Letter! Phys. Rev. B 108, L140503 (2023)
September 29, 2023: We propose how to detect the winding number in driven-dissipative setups, especially in the context of synthetic frequency dimensions. The paper is now on arXiv! arXiv:2309.16101
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 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
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!
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!
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.