Journal Club do Departamento de Física dos Materiais e Mecânica – FMT
Nesta semana o Prof. Fernando Assis Garcia, do Departamento de Física Aplicada, apresentará o artigo: “Direct observation of multiple topological phases in the iron-based superconductor Li(Fe,Co)As”
Dia: 14 de março, quarta-feira, 12h10
Local: Sala de Seminários José Roberto Leite do Edifício Alessandro Volta (bloco C).
Abastract:
Topological insulators/semimetals and unconventional iron-based superconductors have attracted major attentions in condensed matter physics in the past 10 years. However, there is little overlap between these two fields, although the combination of topological states and superconducting states will produce more exotic topologically superconducting states and Majorana bound states (MBS), a promising candidate for realizing topological quantum computations. With the progress in laser-based spin-resolved and angle-resolved photoemission spectroscopy (ARPES) with very high energy- and momentum-resolution, we directly resolved the topological insulator (TI) phase and topological Dirac semimetal (TDS) phase near Fermi level (EF) in the iron-based superconductor Li(Fe,Co)As. The TI and TDS phases can be separately tuned to EF by Co doping, allowing a detailed study of different superconducting topological states in the same material. Together with the topological states in Fe(Te,Se), our study shows the ubiquitous coexistence of superconductivity and multiple topological phases in iron-based superconductors, and opens a new age for the study of high-Tc ironbased superconductors and topological superconductivity. https://arxiv.org/abs/1803.00846
