メーリングリストの皆様
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：２０２４年０５月０８日（水）１０時３０分〜 / Wednesday, 08th May 2024, 10:30 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：Donghoon Kim さん（理研 / RIKEN)
演題：Thermal and Spatial Entanglement of Exotic Quantum Impurity Systems
要旨：
The quantum impurity system is a strongly correlated system that exhibits various non-Fermi liquid phases and has become experimentally engineerable due to advances in nanotechnology. A primary characteristic of this system originates from the quantum coherent screening of the impurity spin by surrounding electrons.
In this work, we theoretically analyze this quantum coherent screening by using quantum entanglement, and suggest how to observe it in experiments. We develop a method to compute the entanglement negativity between the impurity and electrons in spin-1/2 impurity problems, based on the boundary conformal field theory and numerical renormalization group [1]. We examine the thermal entanglement and its spatial distribution, referred to as the screening cloud, in various exotic quantum impurity systems [1,2]. Our findings at low temperatures reveal a universal behavior in the entanglement, characterized by a power-law thermal decay with a fractional exponent. The value of this exponent is intricately linked to the scaling dimension of the boundary operator that represents the impurity spin. Moreover, we observe that the spatial distribution of entanglement follows a universal power-law structure, mirroring the exponent identified in the thermal decay. Our analysis identifies the coexistence of distinct (non-)Fermi liquids within the distribution, which are organized into concentric shells centered around the impurity. As the temperature rises, these outer shells are sequentially diminished, with the outermost shell at any given temperature dictating the system’s overall phase.
[1] D. Kim, J. Shim, and H.-S. Sim, Phys. Rev. Lett. 127, 226801 (2021)
[2] J. Shim, D. Kim, and H.-S. Sim, Nat. Commun. 14, 3521 (2023).
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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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