2016/10/31 by M. M. Glazov, L. E. Golub, G. Wang +5 · 3 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Atomic physics #Biexciton #Chemistry #Condensed matter physics #Excited state #Exciton #Luminescence and Fluorescent Materials #Materials science #Monolayer #Nanotechnology #Perovskite Materials and Applications #Physics #Transition metal #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.95.035311
published as Phys. Rev. B 95, 035311 (2017) · 13 pages, 6 figures
openalex created_date 2016/11/04 · arxiv created 2017/01/11 · openalex publication_date 2017/01/30 · arxiv updated 2017/02/01 · openalex updated_date 2026/08/05
Optical properties of transition metal dichalcogenides monolayers are controlled by Wannier-Mott excitons forming a series of 1s,2s,2p,... hydrogen-like states. We develop the theory of the excited excitonic states energy spectrum fine structure. We predict that p- and s-shell excitons are mixed due to the specific D3h point symmetry of the transition metal dichalcogenide monolayers. Hence, both s- and p-shell excitons are active in both single- and two-photon processes, providing an efficient mechanism of second harmonic generation. The corresponding contribution to the nonlinear susceptibility is calculated.