東京大学生産技術研究所の李と申します。
羽田野研究室では、下記の通りセミナーを開催致します。
皆様の奮ってのご参加をお待ちしております。
なお、当研究室におけるセミナー情報は、次のリンクよりご覧頂けます。
hatano-lab.iis.u-tokyo.ac.jp/seminar-j.html
当セミナーは原則として現地会場での開催となりますが、オンライン参加をご希望の方はご連絡下さい。
＊本案内は複数のメーリングリストにお送りしております。重複して受け取られました方は何卒ご容赦下さい。
Dear All,
This is Jaeha Lee from the Institute of Industrial Science, the University of Tokyo.
We are pleased to announce an upcoming seminar as follows.
Information regarding our seminar series is available on our web site.
hatano-lab.iis.u-tokyo.ac.jp/seminar-e.html
Those who are interested are welcome to join us on-site. For those who wish to join us online, please feel free to contact us.
* Apologies if you have received multiple copies of this announcement.
記
日時：２０２５年０７月１０日（木）１４時００分〜 / Thursday, 10th July 2025, 14:00 JST –
場所：東京大学生産技術研究所 研究実験棟Ｉ大会議室 / The large conference room, Research and Testing Complex I, IIS, the University of Tokyo
来場：http://hatano-lab.iis.u-tokyo.ac.jp/access-j.html / hatano-lab.iis.u-tokyo.ac.jp/access-e.html
講師：白井俊也（Shirai Shunya）さん（大阪公立大 / Osaka Metro. U.）
演題：The dynamics of a particle embedded in a topological environment
要旨：In the most well-known dynamical process in open quantum systems, the particle decays exponentially and is irreversibly transferred to the environment. This process can be described by the so-called “resonance state” and its complex eigenvalue. However, this picture can be modified in numerous ways when one changes the properties of the environment into which the system decays. For example, strong coupling to the environment can induce an atom-photon bound state, such that the particle cannot decay completely from the original system (“fractional decay”).
We consider a system which a quantum emitter decays into an infinite extension of the Su-Schrieffer-Heeger (SSH) chain with alternating nearest-neighbor couplings J_1 and J_2. This system behaves analogously to a one-dimensional topological insulator from condensed matter physics. Curiously, we discovered a surface-like zero-energy state in the SSH chain that strongly influences the dynamics of the quantum emitter, despite being entirely decoupled from it (seemingly like an “atom-photon bound state” – but without any contribution from the “atom”). Further, we found that when the quantum emitter coupling g corresponds to g=√(J_1^2 – J_2^2), an exceptional point occurs at which two other in-gap states coalesce with the zero-energy state to form a peculiar state that extends in only one direction. Now, we try to investigate that how this peculiar state affects the dynamics of a particle.
[1] N. Hatano, K. Sasada, H. Nakamura, and T. Petrosky, Prog. Theor. Phys. 119, 187 (2008).
[2] S. Garmon, T. Petrosky, L. Simine, and D. Segal, Fortschr. Phys. 61, 261 (2013).
[3] S. Garmon, G. Ordonez, N. Hatano, Phys. Rev. Res. 3, 033029 (2021).
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李 宰河
〒277-8574 千葉県柏市柏の葉５－１－５
東京大学生産技術研究所
電 話：04-7136-6962
メール：lee@iis.u-tokyo.ac.jp
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