Breakdown of Hydrodynamic Transport Theory in the Ordered Phase of Helimagnets

Abstract

It is shown that strong fluctuations preclude a hydrodynamic description of transport phenomena in helimagnets, such as MnSi, at T>0. This breakdown of hydrodynamics is analogous to the one in chiral liquid crystals. Mode-mode coupling effects lead to infinite renormalizations of various transport coefficients, and the actual macroscopic description is nonlocal. At T=0 these effects are weakened due to the fluctuation-dissipation theorem, and the renormalizations remain finite. Observable consequences of these results, as manifested in the neutron scattering cross-section, are discussed

4pp., 1 eps figure

References in corpus (4)

• Fundamental Aspects of Quantum Brownian Motion
• Theory of helimagnons in itinerant quantum systems
• Long-Time Tails, Weak Localization, and Classical and Quantum Critical Behavior
• Quantum Collective Creep: a Quasiclassical Langevin Equation Approach

Cited by in corpus (2)

• Spin dynamics of antiferromagnets in the presence of a homogeneous magnetization
• Analogy between Three-Dimensional Helimagnetic Metals and Two-Dimensional Nonmagnetic Metals: Transport in the Weak-Disorder Regime