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東京大学理学系研究科・佐野研究室の上道雅仁です。
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Date： Sept. 25th, Tue. 15:30-
Place： Faculty of Science Building #1, room 414 (4th Floor)
東京大学本郷キャンパス理学部1号館4階 414号室
Speaker： Dr. Benoit Mahault (UT, CEA, Saclay)
Title： "Active Matter Class with Second-Order Transition to
Quasi-Long-Range Polar Order"
Abstract:
We introduce and study in two dimensions a new class of dry, aligning
active matter that exhibits a direct transition to orientational order,
without the phase-separation phenomenology usually observed in this
context. Characterized by self-propelled particles with velocity
reversals and a ferromagnetic alignment of polarities, systems in this
class display quasi-long-range polar order with continuously varying
scaling exponents, yet a numerical study of the transition leads to
conclude that it does not belong to the Berezinskii-Kosterlitz-Thouless
universality class but is best described as a standard critical point
with an algebraic divergence of correlations. We rationalize these
findings by showing that the interplay between order and density changes
the role of defects.
上道 雅仁
Masahito UWAMICHI
Higuchi Laboratory, Sano Laboratory
Graduate School of Science, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo
113-0033 JAPAN
Email:uwamichi@daisy.phys.s.u-tokyo.ac.jp