| Full text | |
| Author(s): |
de Carvalho, V. S.
;
Freire, H.
;
Miranda, E.
;
Pereira, R. G.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 98, n. 15, p. 12-pg., 2018-10-02. |
| Abstract | |
We investigate the edge magnetism and the spin transport properties of an SU(2)-symmetric Kitaev spin liquid (KSL) model put forward by Yao and Lee [Phys. Rev. Lett. 107, 087205 (2011)] on the honeycomb lattice. In this model, the spin degrees of freedom fractionalize into a Z(2) static gauge field and three species of either gapless (Dirac) or gapped (chiral) Majorana fermionic excitations. We find that, when a magnetic field is applied on a zigzag edge, the Dirac KSL exhibits a nonlocal magnetization associated with the existence of zero-energy edge modes. The application of a spin bias V = mu(up arrow) - mu(down arrow) y at the interface of the spin system with a normal metal produces a spin current into the KSL, which depends as a power law on V, in the zero-temperature limit, for both Dirac and chiral KSLs, but with different exponents. Lastly, we study the longitudinal spin Seebeck effect, in which a spin current is driven by the combined action of a magnetic field perpendicular to the plane of the honeycomb lattice and a thermal gradient at the interface of the KSL with a metal. Our results suggest that edge magnetization and spin transport can be used to probe the existence of charge-neutral edge states in quantum spin liquids. (AU) | |
| FAPESP's process: | 16/05069-7 - Study of transport properties of low-energy models relevant to cuprate superconductors and quantum spin liquids |
| Grantee: | Vanuildo Silva de Carvalho |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |