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セミナーシリーズを開催することにしました。
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Speaker: Jun Takahashi (U. New Mexico)
Time & Date: 10:00 – 11:00 (JST), April 28, 2022
Place: Online (Zoom meeting)
Title: Probing the Vicinity of Deconfined Quantum Critical Point with
Quantum Monte Carlo
Abstract:
Deconfined quantum criticality (DQC) is a beyond-Landau paradigm quantum
phase transition predicted to occur in a 2d quantum magnet between a
Neel phase and a valence bond solid (VBS) phase. Although the two phases
are not related in the traditional symmetry-breaking perspective, field
theory predicts that at the DQC transition point the order of the phases
fractionalizes and creates an emergent gauge field, letting the Neel-VBS
transition generically continuous.
By constructing concrete models that could be simulated to a large scale
with quantum Monte Carlo methods, we numerically study the Neel-VBS
transition and find that there is an emergent higher symmetry at the
first-order transition point up to a very large system size. We also
find that there are a number of new perturbations to the DQC point that
were previously overlooked, and show that they lead to a different phase
diagram, possibly resolving the previously observed discrepancy between
theoretical conformal bootstrap calculation and numerical studies.
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—
Satoshi Morita (森田 悟史)
The Institute for Solid State Physics, The University of Tokyo
kawashima.issp.u-tokyo.ac.jp/people/morita/
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