Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 33: Poster II

HL 33.5: Poster

Mittwoch, 29. März 2023, 17:00–19:00, P1

Stokes shift of twisted bilayer WSe2 — •Zihao Liu¹, Yang Pan^1,2, and Dietrich R. T. Zahn^1,2 — ¹Semiconductor Physics, Institute of Physics, Chemnitz University of Technology, Chemnitz, Germany — ²Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, Chemnitz, Germany

Transition metal dichalcogenides (TMDCs) with a typical layered structure have exceptional optical properties exhibiting a characteristic absorption and emission at excitonic resonances. The weak van der Waals (vdW) interlayer coupling nature enables the possibility of artificial staking, leading to homo- and hetero-structures formation. It was demonstrated in our previous work that the optical properties can be strongly modified by the twisting angle.

Here, WSe2 monolayers (MLs) were obtained by mechanical exfoliation, which were then transferred onto sapphire substrates by a tear-and-stack method to form twisted homo-bilayers with a precision of 0.08°. We then performed optical transmission and photoluminescence (PL) experiments on monolayers, intrinsic bilayers and twisted bilayers to determine the Stokes shift values on a full period (0°-60°) of twisted bilayer WSe2.