Fig. 2: Theory of excitons in high-symmetry stackings of MoSe2-WSe2 heterobilayer and heterotrilayer.
From: Moiré excitons in MoSe2-WSe2 heterobilayers and heterotrilayers
a Schematics of twisted HBL and HTL MoSe2-WSe2 with different high-symmetry stackings. b, c Energy and squared sum of coordinate operator (multiplied by 100 below 1.55 eV) for intralayer and interlayer excitons in HBL and HTL, respectively, calculated for three different stackings. Filled squares, circles, and diamonds denote A'B', AA, and AB', and (A'B')A', (AA)A', and (AB')A' stackings in HBL and HTL, respectively. Empty symbols indicate corresponding HTL excitons with electrons residing in the topmost MoSe2 layer. For zero-momentum KK interlayer excitons (top panels) we indicate the spin configuration by solid and dashed lines for spin-like and spin-unlike states (corresponding to spin-singlet and spin-triplet excitons), and the polarization of the respective exciton emission by red (σ+), blue (σ−), and black (in-plane z) colors. The bottom panels show the energy of finite-momentum interlayer excitons in QK (green), QΓ (orange), and KΓ (violet) configurations without direct radiative transitions.
