Theory of helimagnons in itinerant quantum systems

Details Theory of helimagnons in itinerant quantum systems Theory of helimagnons in itinerant quantum systems

2005-10-17

arxiv.org/abs/cond-mat/0510444v2

Phys. Rev. B 73, 054431 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

20 pp., 1 eps fig; corrects various typos and incorrect prefactors in Phys Rev B version

Scientific paper

10.1103/PhysRevB.73.054431

The nature and effects of the Goldstone mode in the ordered phase of helical or chiral itinerant magnets such as MnSi are investigated theoretically. It is shown that the Goldstone mode, or helimagnon, is a propagating mode with a highly anisotropic dispersion relation, in analogy to the Goldstone mode in chiral liquid crystals. Starting from a microscopic theory, a comprehensive effective theory is developed that allows for an explicit description of the helically ordered phase, including the helimagnons, for both classical and quantum helimagnets. The directly observable dynamical spin susceptibility, which reflects the properties of the helimagnon, is calculated.

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