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

DURAN, ALEJO COSTA; STURLA, MAURICIO

Physical Review B

American Physical Society

Año: 2020 vol. 102

2469-9950

In this Rapid Communication 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 Berezinskii-Kosterlitz-Thouless (BKT) transition occurs. In the opposite regime, the one dominated by the DM interaction, a kind of inverse BKT transition takes place. As temperature rises, the vortex-antivortex lattice starts melting by the annihilation of vortex-antivortex pairs, in a sort of ?inverse? BKT transition.