Artículos de revistas
Chiral Spin-Orbital Liquids with Nodal Lines
Fecha
2016-07-01Registro en:
Physical Review Letters, v. 117, n. 1, 2016.
1079-7114
0031-9007
10.1103/PhysRevLett.117.017204
2-s2.0-84977646911
Autor
Universidade de São Paulo (USP)
Universidade Estadual Paulista (UNESP)
Universidade Estadual de Campinas (UNICAMP)
Universidade Federal Do Rio Grande Do Norte
Institución
Resumen
Strongly correlated materials with strong spin-orbit coupling hold promise for realizing topological phases with fractionalized excitations. Here, we propose a chiral spin-orbital liquid as a stable phase of a realistic model for heavy-element double perovskites. This spin liquid state has Majorana fermion excitations with a gapless spectrum characterized by nodal lines along the edges of the Brillouin zone. We show that the nodal lines are topological defects of a non-Abelian Berry connection and that the system exhibits dispersing surface states. We discuss some experimental signatures of this state and compare them with properties of the spin liquid candidate Ba2YMoO6.