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Quasiparticles, flat bands and the melting of hydrodynamic matter
- Source :
- Nature Physics. 19:536-544
- Publication Year :
- 2023
- Publisher :
- Springer Science and Business Media LLC, 2023.
-
Abstract
- The concept of quasiparticles -- long-lived low-energy particle-like excitations -- has become a keystone 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 behavior of a classical system of hydrodynamically interacting particles in two dimensions. In the disordered phase of this matter, measurements reveal a sub-population of long-lived particle pairs. Modeling 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 threefold 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.
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Strongly Correlated Electrons (cond-mat.str-el)
Quantum Gases (cond-mat.quant-gas)
Condensed Matter::Superconductivity
Soft Condensed Matter (cond-mat.soft)
FOS: Physical sciences
General Physics and Astronomy
Condensed Matter - Soft Condensed Matter
Condensed Matter - Quantum Gases
Subjects
Details
- ISSN :
- 17452481 and 17452473
- Volume :
- 19
- Database :
- OpenAIRE
- Journal :
- Nature Physics
- Accession number :
- edsair.doi.dedup.....333f9b3971662b809187f99e0ded090f