2012/08/31 by Dmitry K. Efimkin, D. K. Efimkin, Yu. E. Lozovik · 2 citations
Materials Science · Physics and Astronomy · #Angular momentum #Condensed matter physics #Exciton #Faraday cage #Faraday effect #Graphene research and applications #Insulator (electricity) #Magnetic field #Optoelectronics #Physics #Quantum and electron transport phenomena #Quantum mechanics #Topological Materials and Phenomena #Topological insulator #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.87.245416
published as Physical Review B 87, 245416 (2013) · 7 pages, 8 figures, Published version
openalex publication_date 2013/06/13 · arxiv created 2013/06/20 · arxiv updated 2013/08/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Manifestations of chiral excitons on a magnetically gapped surfaces of a topological insulator thin film in Kerr and Faraday effects are analyzed. Excitonic contribution to a surface optical conductivity tensor is calculated. Chiral excitons contrary to conventional ones resonantly contribute to Hall conductivity due to the lack of symmetry between the states with opposite angular momentum. They can lead to the considerable enhancement of Faraday angle and ellipticity of transmitted electromagnetic wave. Chiral excitons cause a decrease of Kerr angle and prominent signatures in ellipticity of reflected electromagnetic wave. Conditions for experimental observation of the described effects are discussed.