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Modulated spiral phases in doped quantum antiferromagnets

1990; EDP Sciences; Volume: 51; Issue: 9 Linguagem: Inglês

10.1051/jphys

2777-3396

T. Dombre,

Advanced Condensed Matter Physics

We study the spiral phase discovered by Shraiman and Siggia, in the regime of coupling constant where the effective spin wave stiffness is negative. We show that this instability does not signal a phase separation but rather the formation of domain walls in the (1, 1) or (1, 1) directions on a square lattice, where holes get trapped. We discuss briefly the interplay between dipolar and Coulomb interactions in the resulting structure Nous etudions la phase spirale decouverte par Shraiman et Siggia, dans le regime ou sa constante de raideur devient negative. Nous montrons que cette instabilite ne signale pas une separation de phase mais plutot la formation de murs suivant les directions (1, 1) ou (1, 1) sur un reseau carre, ou les trous se localisent. Nous discutons brievement l'effet d'une repulsion coulombienne a longue portee dans une telle structure