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Quasiparticles, flat bands and the melting of hydrodynamic matter

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Title
Quasiparticles, flat bands and the melting of hydrodynamic matter
Author(s)
Imran Saeed; Hyuk Kyu Pak; Tsvi Tlusty
Publication Date
2023-04
Journal
NATURE PHYSICS, v.19, no.4, pp.536 - 544
Publisher
NATURE PORTFOLIO
Abstract
The concept of quasiparticles-long-lived low-energy particle-like excitations-has become a cornerstone of condensed quantum matter, where it explains a variety of emergent many-body phenomena such as superfluidity and superconductivity. Here we use quasiparticles to explain the collective behaviour of a classical system of hydrodynamically interacting particles in two dimensions. In the disordered phase of this matter, measurements reveal a subpopulation of long-lived particle pairs. Modelling and simulation of the ordered crystalline phase identify the pairs as quasiparticles, emerging at the Dirac cones of the spectrum. The quasiparticles stimulate supersonic pairing avalanches, bringing about the melting of the crystal. In hexagonal crystals, where the intrinsic three-fold symmetry of the hydrodynamic interaction matches that of the crystal, the spectrum forms a flat band dense with ultra-slow, low-frequency phonons whose collective interactions induce a much sharper melting transition. Altogether, these findings demonstrate the usefulness of concepts from quantum matter theory in understanding many-body physics in classical dissipative settings. The concept of quasiparticles helps to describe various quantum phenomena in solids. It is now shown that certain properties of a classical system of hydrodynamically interacting particles can also be described by means of quasiparticles.
URI
https://pr.ibs.re.kr/handle/8788114/13523
DOI
10.1038/s41567-022-01893-5
ISSN
1745-2473
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
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