Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.12: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Chiral spin-orbital liquids with nodal lines — •Willian Massashi Hisano Natori1, Rodrigo Gonçalves Pereira1, and Eduardo Miranda2 — 1Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, Brazil — 2Instituto de Física Gleb Wataghin, Unicamp, Campinas, Brazil
Quantum spin liquids (QSL) are strongly correlated systems that remain magnetically disordered down to 0 K. Although QSLs are known to be the ground state of many model Hamiltonians, their experimental discovery is debated, underlining the importance of research on spin liquid states arising from realistic Hamiltonian models. In this work, we propose a quantum spin-orbital liquid as a stable phase of a spin-orbital model in double ordered perovskites (DOP). This model accounts for antiferromagnetic interactions and strong spin-orbit coupling. We made a global SU(2) and compass symmetries explicit through a convenient representation. Afterwards, we rewrite the Hamiltonian in terms of Majorana fermion operators plus a Z2 gauge field. A mean-field decoupling preserving the model symmetries was proposed, whose ground state is a QSL characterized by degenerate gapless Fermi lines. The fact that these lines are associated with a topological invariant and the presence of energetically separated surface states indicates that this QSL is topologically non-trivial. Some predicted results are compared with the experimental data available for the spin liquid candidate Ba2YMoO6.