2018/03/31 by Viktor Eisler, Florian Maislinger · 4 citations
Mathematics · Physics and Astronomy · #Classical XY model #Condensed matter physics #Dispersion (optics) #Domain wall (magnetism) #Excitation #Ferromagnetism #Gaussian #Geometry #Ground state #Magnetic field #Magnetization #Mathematics #Phase (matter) #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum entanglement #Quantum many-body systems #Quantum mechanics #Scaling #Statistical physics #Transfer matrix #cond-mat.stat-mech #quant-ph
paper · pdf · doi:10.1103/physrevb.98.161117
published as Phys. Rev. B 98, 161117(R) (2018) · 8 pages, 4 figures, v2: minor changes, references added, v3: as published
arxiv created 2018/10/22 · openalex publication_date 2018/10/22 · arxiv updated 2019/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We study the melting of a domain wall, prepared as a certain low-energy excitation above the ferromagnetic ground state of the XY chain. In a well-defined parameter regime the time-evolved magnetization profile develops sharp kinklike structures in the bulk, showing features of a phase transition in the hydrodynamic scaling limit. The transition is of a purely dynamical nature and can be attributed to the appearance of a negative effective mass term in the dispersion. The signatures are also clearly visible in the entanglement profile measured along the front region, which can be obtained by covariance-matrix methods despite the state being non-Gaussian.