（重複して受取られた場合はご容赦ください）
東大物性研の高橋惇です。
テネシー大のジョン・デミディオさんによるエンタングルメントエントロピーの新しい数値計算アルゴリズムに関するセミナーを再来週の木曜日朝に、下記の通り開催します。
新たにzoom参加をご希望の方は、ウェブサイトからご登録ください。
kawashima.issp.u-tokyo.ac.jp/mcs/
（以前のセミナーで登録された方は再登録不要です）
皆様のご参加をお待ちしています。
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Speaker: Jonathan D’Emidio (University of Tennessee)
Time & Date: 9:00 – 10:00, February 20 (Thursday), 2024 (JST)
Place: Online (Zoom)
Title:
*Entanglement Entropy at Deconfined and Gross-Neveu Quantum Critical Points*
Abstract:
The structure of entanglement underpins much of our understanding of modern
condensed matter physics. The most basic quantifier, the entanglement
entropy, displays universal properties that offer a unique characterization
of quantum many-body systems. In this talk I will introduce a technique for
computing entanglement entropy in quantum Monte Carlo simulations, based on
the concept of nonequilibrium work to compute free energy differences,
which allows for precise calculations of unprecedented size. As an
application of this approach, I will present results on a 2D quantum spin
model for deconfined criticality, where emergent symmetry is observed at
the critical point between two disparate ordered phases. Finally, I will
show how this methodology can be successfully adapted to study 2D models of
interacting fermions. This is applied to the Hubbard model on the honeycomb
lattice, which realizes a Dirac semi-metal phase separated by a Gross-Neveu
transition from an antiferromagnetic Mott insulator. I will present results
throughout the phase diagram and at the critical point of this model, where
universal logarithmic terms of the entanglement entropy are observed for
the first time.
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