Work

Interacting virtual topological phases in defect-rich two-dimensional materials

Year: 2025

Type: article

Abstract: We investigate the robustness of virtual topological states---topological phases away from the Fermi energy---against the electron-electron interaction and band filling. As a case study, we employ a realistic model to investigate the properties of vacancy-driven topological phases in transition metal dichalcogenides (TMDs) and establish a connection between the degree of localization of topological wave functions, the vacancy density, and the electron-electron interaction strength with the topological phase robustness. We demonstrate that electron-electron interactions play a crucial role in degrading topological phases thereby determining the validity of single-particle approximations for topological insulator phases. Our findings can be naturally extended to virtual topological phases of a wide range of materials.

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

DOI: 10.1103/physrevb.111.195135

Authors: F. Crasto de Lima, Roberto H. Miwa, Caio Lewenkopf, Adalberto Fazzio

Institutions: Brazilian Center for Research in Energy and Materials, Universidade Federal de Uberlândia, Universidade Federal do Rio de Janeiro

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, Fundação de Amparo à Pesquisa do Estado de Minas Gerais

Award: Materials by design: from quantum materials to energy applications