Work

Two-dimensional orbital Hall insulators

Year: 2020

Type: article

Abstract: Detailed analyses of the spin and orbital conductivities are performed for different topological phases of certain classes of two-dimensional multiorbital materials. Our calculations show the existence of orbital-Hall effect (OHE) in topological insulators, with values that exceed those obtained for the spin-Hall effect (SHE). Notably, we have found nontopological insulating phases that exhibit OHE in the absence of SHE. We demonstrate that the OHE in these systems is deeply linked to exotic momentum-space orbital textures that are triggered by an intrinsic Dresselhaus-type interaction that arises from a combination of orbital attributes and lattice symmetry. Our results strongly indicate that other classes of systems with nontrivial orbital textures and/or orbital magnetism may also exhibit large OHE even in their normal insulating phases.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.101.075429

Authors: Luis M. Canonico, Tarik P. Cysne, Tatiana G. Rappoport, R. B. Muniz

Institutions: Universidade Federal Fluminense, Universidade Federal do Rio de Janeiro, Universidade Federal de São Carlos, University of Minho

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro

Award: G7924626277