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. 2011 May 20;106(20):207201.
doi: 10.1103/PhysRevLett.106.207201. Epub 2011 May 16.

Parity-broken chiral spin dynamics in Ba₃NbFe₃Si₂O₁₄

M Loire  1 , V Simonet, S Petit, K Marty, P Bordet, P Lejay, J Ollivier, M Enderle, P Steffens, E Ressouche, A Zorko, R Ballou
Affiliations

Parity-broken chiral spin dynamics in Ba₃NbFe₃Si₂O₁₄

M Loire et al. Phys Rev Lett. .

Abstract

The spin-wave excitations emerging from the chiral helically modulated 120° magnetic order in a langasite Ba₃NbFe₃Si₂O₁₄ enantiopure crystal were investigated by unpolarized and polarized inelastic neutron scattering. A dynamical fingerprint of the chiral ground state is obtained, singularized by (i) spectral weight asymmetries answerable to the structural chirality and (ii) a full chirality of the spin correlations observed over the whole energy spectrum. The intrinsic chiral nature of the spin waves' elementary excitations is shown in the absence of macroscopic time-reversal symmetry breaking.

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