Vortex lattice in two-dimensional chiral XY ferromagnets and the inverse Berezinskii-Kosterlitz-Thouless transition

In this Letter we will show that, in the presence of a properly modulated Dzyaloshinskii-Moriya (DM) interaction, a U(1) vortex-antivortex lattice appears at low temperatures for a wide range of the DM interaction. Even more, in the region dominated by the exchange interaction, a standard BKT transi...

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Detalles Bibliográficos
Autores principales: Costa Durán, Alejo, Sturla, Mauricio
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Física
Physics
Lattice (order)
Vortex
Exchange interaction
Annihilation
Inverse
Condensed matter physics
Dm interaction
Kosterlitz–thouless transition
Ferromagnetism
Type-ii superconductor
Superfluidity
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125124
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
Sumario:In this Letter we will show that, in the presence of a properly modulated Dzyaloshinskii-Moriya (DM) interaction, a U(1) vortex-antivortex lattice appears at low temperatures for a wide range of the DM interaction. Even more, in the region dominated by the exchange interaction, a standard BKT transition occurs. In the opposite regime, the one dominated by the DM interaction, a kind of inverse BKT transition (iBKT) takes place. As temperature rises, the vortex-antivortex lattice starts melting by annihilation of pairs of vortex-antivortex, in a sort of “inverse” BKT transition.

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