Edge magnetization and spin transport in an SU(2)-symmetric Kitaev spin liquid
V. S. de Carvalho, H. Freire, E. Miranda and R. G. Pereira
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Agradecimentos: Two of us (V.S.deC. and E.M.) would like to thank C. Farias for stimulating discussions. They also thank the financial support from FAPESP under Grant No. 2016/05069-7, and the kindly hospitality of the International Institute of Physics (IIP), in Natal, where part of this work was...
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Agradecimentos: Two of us (V.S.deC. and E.M.) would like to thank C. Farias for stimulating discussions. They also thank the financial support from FAPESP under Grant No. 2016/05069-7, and the kindly hospitality of the International Institute of Physics (IIP), in Natal, where part of this work was done; IIP is supported by the Brazilian ministries MEC and MCTIC. H.F. acknowledges funding from CNPq under Grant No. 405584/2016-4
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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...
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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
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FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2016/05069-7
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
405584/2016-4
Aberto
Edge magnetization and spin transport in an SU(2)-symmetric Kitaev spin liquid
V. S. de Carvalho, H. Freire, E. Miranda and R. G. Pereira
Edge magnetization and spin transport in an SU(2)-symmetric Kitaev spin liquid
V. S. de Carvalho, H. Freire, E. Miranda and R. G. Pereira
Fontes
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Physical review. B, Covering condensed matter and materials physics Vol. 98, n. 15 (Oct., 2018), n. art. 155105, p. 1-12 |