2017/02/10 by Z. R. Gong, W. Z. Luo, Z. F. Jiang +1 · 16 citations
Materials Science · Physics and Astronomy · #2D Materials and Applications #Domain wall (magnetism) #Exciton #Graphene research and applications #Magnetic field #Metal #Monolayer #Topological Materials and Phenomena #Topological degeneracy #Topology (electrical circuits) #Transition metal #cond-mat.mes-hall
paper · pdf · doi:10.1038/srep42390
published in Scientific Reports 7(1), 42390 (Nature Portfolio) · 9 pages, 3 figures
openalex publication_date 2017/02/10 · openalex created_date 2017/02/17 · arxiv created 2017/03/30 · arxiv updated 2017/03/31 · openalex updated_date 2026/08/05
We theoretically investigate the chiral topological excitons emerging in the monolayer transition metal dichalcogenides, where a bulk energy gap of valley excitons is opened up by a position dependent external magnetic field. We find two emerging chiral topological nontrivial excitons states, which exactly connects to the bulk topological properties, i.e., Chern number = 2. The dependence of the spectrum of the chiral topological excitons on the width of the magnetic field domain wall as well as the magnetic filed strength is numerically revealed. The chiral topological valley excitons are not only important to the excitonic transport due to prevention of the backscattering, but also give rise to the quantum coherent control in the optoelectronic applications.