Theory of helimagnons in itinerant quantum systems

D. Belitz, T. R. Kirkpatrick, and A. Rosch
Phys. Rev. B 73, 054431 – Published 24 February 2006

Abstract

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.

  • Figure
  • Received 18 October 2005

DOI:https://doi.org/10.1103/PhysRevB.73.054431

©2006 American Physical Society

Authors & Affiliations

D. Belitz1,2, T. R. Kirkpatrick1,3, and A. Rosch4

  • 1Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA
  • 2Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, USA
  • 3Institute for Physical Science and Technology, and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 4Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

See Also

Theory of helimagnons in itinerant quantum systems. II. Nonanalytic corrections to Fermi-liquid behavior

D. Belitz, T. R. Kirkpatrick, and A. Rosch
Phys. Rev. B 74, 024409 (2006)

Theory of helimagnons in itinerant quantum systems. IV. Transport in the weak-disorder regime

T. R. Kirkpatrick, D. Belitz, and Ronojoy Saha
Phys. Rev. B 78, 094408 (2008)

Theory of helimagnons in itinerant quantum systems. III. Quasiparticle description

T. R. Kirkpatrick, D. Belitz, and Ronojoy Saha
Phys. Rev. B 78, 094407 (2008)

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Issue

Vol. 73, Iss. 5 — 1 February 2006

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