Anomalous energy transport in the Berezinskii-Kosterlitz-Thouless phase

Autor:	Hiura, Ken
Rok vydání:	2024
Předmět:	Condensed Matter - Statistical Mechanics Condensed Matter - Soft Condensed Matter
Druh dokumentu:	Working Paper
Popis:	We study nonlinear fluctuating hydrodynamic theories with charge and energy conservation in and above two dimensions that describe the large-scale behavior of the Hamiltonian XY model in the disordered and ordered phases. Using renormalization group analysis at one-loop order, we show that while Fourier's law holds in the ordered phase above two dimensions and in the disordered phase in any dimension, the energy diffusivity in the ordered phase exactly in two dimensions, the Berezinskii-Kosterlitz-Thouless phase, exhibits a logarithmic divergence in the thermodynamic limit. This divergence arises from elastic energy transport induced by spin-wave excitations. Comment: 46 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2410.20397 Zobrazit plný text záznamu View this record from Arxiv