Phase diagram and quantum order by disorder in the kitaev K1 - K2 honeycomb magnet
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
Abstract
We show that the topological Kitaev spin liquid on the honeycomb lattice is extremely fragile against the second-neighbor Kitaev coupling K2, which has recently been shown to be the dominant perturbation away from the nearest-neighbor model in iridate Na2IrO3, and may also play a role in α-RuCl3 and Li2IrO3. This coupling naturally explains the zigzag ordering (without introducing unrealistically large longer-range Heisenberg exchange terms) and the special entanglement between real and spin space observed recently in Na2IrO3. Moreover, the minimal K1 - K2 model that we present here holds the unique property that the classical and quantum phase diagrams and their respective order-by-disorder mechanisms are qualitatively different due to the fundamentally different symmetries of the classical and quantum counterparts.
Details
Originalsprache | Englisch |
---|---|
Aufsatznummer | 041035 |
Fachzeitschrift | Physical Review X |
Jahrgang | 5 |
Ausgabenummer | 4 |
Publikationsstatus | Veröffentlicht - 2015 |
Peer-Review-Status | Ja |