CMSP Seminar @ICTP Stasi, Thursday 26 July at 11:00 am- Daniel Cabra

[CM Section]

Condensed Matter and Statistical Physics Seminar

Thursday 26 July at 11:00 a.m.
Stasi Seminar Room, first floor, Leonardo

Daniel CABRA
Univ. Nacional de La Plata, Argentina

 From Skyrmions to Z2 Vortices in Frustrated
Chiral Magnets

Abstract:

The classical triangular antiferromagnetic Heisenberg model with 
Dzyaloshinskii-Moriya interactions in a magnetic field is studied. We 
focus in particular on the emergence of a composite spin crystal phase 
that was recently observed in [Phys. Rev. B 92, 214439 (2015)] for 
intermediate fields. This complex phase, which corresponds to a lattice 
of Z2 vortices, can be made up from three inter-penetrated skyrmion 
lattices, one for each sub-lattice of the original triangular one. We 
present our numerical results and the explicit construction of the 
low-energy effective action that reproduces the correct phenomenology. 
This effective action could serve as a starting point to study the 
coupling to charge carriers, lattice vibrations, structural disorder and 
transport phenomena.