Intrinsic circularly polarized exciton emission in a twisted van der Waals heterostructure

Twistronics and moiré excitonic physics in van der Waals heterostructures

“…Then the interlayer twist of bilayer structures is employed to realize continuous tunning, of which excitonic physics is the most concerned [22,41,65]. It is theoretically predicted that relative twist between constituent layers can affect the excitonic phenomena and exciton dynamics through interlayer couplings [52] and electronic band structures [46,68,69], which has been confirmed and further explored in subsequent experiments [45,51,[70][71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86].…”

Indirect bandgap MoSe2 resonators for light-emitting nanophotonics

“…The most prospective semiconductive materials seem to be transition metal dichalcogenides (TMDCs). This is due to the unique properties of their monolayers such as extraordinary light absorption, 6 large exciton binding energies, 7,8 strong and tailoring photoluminescence, [9][10][11] the possibility of creating van der Waals heterostructures, 12,13 twisting engineering, [14][15][16] etc. Such an active investigation of TMDC monolayers has revived interest in studying the properties of their bulk samples.…”

Fermi polaron fine structure in strained van der Waals heterostructures

“…Three-fold rotational symmetry combined with the broken inversion symmetry in monolayers results in chiral selection rules for optical transitions that enable both spin and valley orientation of charge carriers and excitons with circularly polarized light and valley entanglement with linearly polarized light [4][5][6][7][8][9]. Additional degrees of freedom are provided by bilayer structures where the material composition, atomic registry, twist angle and moiré potentials enable further control of optical, spin and valley effects in these extremely 2D semiconductors [10][11][12][13][14][15][16][17][18].…”