Magnon BEC and various phases of 3D quantum helimagnets under high magnetic field

Details Magnon BEC and various phases of 3D quantum helimagnets under high magnetic field Magnon BEC and various phases of 3D quantum helimagnets under high magnetic field

2009-05-04

arxiv.org/abs/0905.0249v2

Phys. Rev. B 80, 014417 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

9pages, 6figures

Scientific paper

We study high-field phase diagram and low-energy excitations of three-dimensional quantum helimagnets. Slightly below the saturation field, the emergence of magnetic order may be viewed as Bose-Einstein condensation (BEC) of magnons. The method of dilute Bose gas enables a quantitative analysis of quantum effects in these helimagnets and thereby three phases are found: cone, coplanar fan and a phase-separated one. As an application, we map out the phase diagram of a 3D helimagnet which consists of frustrated J1-J2 chains as a function of frustration and an interchain coupling. Moreover, we also calculate the stability of the 2-magnon bound state to investigate the possibility of the bound-magnon BEC.

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