Friday 19
Quantum Information
Takis Kontos
› 12:05 - 12:30 (25min)
› Amphitéatre Rataud
Multicomponent Skyrmion lattices and their excitations
Benoît Douçot  1@  , Dima Kovrizhin  2@  , Roderich Moessner  3@  
1 : Laboratoire de Physique Théorique et Hautes Energies  (LPTHE)  -  Website
CNRS : UMR7589, Université Paris VI - Pierre et Marie Curie, Université Paris VII - Paris Diderot
4 place Jussieu Paris -  France
2 : Max Planck Institute for the Physics of comples systems  (MPIPKS)  -  Website
Nöthnitzer Straße 38 01187 Dresden Germany -  Allemagne
3 : Max Planck Institute for the Physics of complex systems  (MPIPKS)  -  Website
Nöthnitzer Straße 38 01187 Dresden Germany -  Allemagne

We study quantum Hall ferromagnets with a finite density of topologically charged spin textures in the presence of internal degrees of freedom such as spin, valley, or layer indices, so that the system is parametrized by a d-component spinor field. In the absence of anisotropies we find a hexagonal Skyrmion lattice that completely breaks the underlying SU(d) symmetry with the low-lying excitation spectrum separating into d^2-1 gapless acoustic magnetic modes and a magnetophonon. The ground state charge density modulations, which inevitably exist in these lattices, vanish exponentially in d. We discuss the role of effective mass anisotropy for SU(3)-valley Skyrmions relevant to experiments with AlAs quantum wells. Here we find a transition which breaks a sixfold rotational symmetry of the triangular lattice, followed by the formation of a square lattice at large values of anisotropy strength.


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