Presentation Information
[9p-E206-6]Charge-filling induced anomalous evolution of moiré trion quantum coherence in WSe2/MoSe2 heterobilayer
〇Wang Haonan1, Kenji Watanabe2, Takashi Taniguchi2, Kazunari Matsuda1 (1.IAE, Kyoto Univ., 2.NIMS)
Keywords:
moire trion,coherence,strong correlation
Recently, the studies of quantum science in semiconducting two-dimensional (2D) materials have attracted much attention. The quantum two-level systems formed by the moiré exciton and ground state in the semiconducting heterobilayer exhibits significantly enhanced quantum coherence compared with that of delocalized 2D-excitons in the monolayer semiconductor, which holds substantial promise for considerably advancing emerging quantum science and technologies. Recent advances in investigations pertaining to the charge filling of moiré potentials have provided new opportunities for controlling the electronic properties of moiré systems. However, the interplay between the coherence of moiré-based quantum states and charge filling hasn’t been elucidated yet. Here we investigate the evolution of the quantum coherence of moiré excitonic states in a WSe2/MoSe2 heterobilayer device as a function of charge filling to the moiré potential. From experimental approaches of light emission interferogram and numerical simulation based on Monte Carlo method, a significant narrowing of the homogeneous linewidth of the moiré charged exciton (trion) was exhibited near the filling factor (ν) of 1, which corresponds to integer charge filling in each 2D hexagonal moiré lattice. This corresponds to a substantially extended trion coherence time exceeding 25 ps at 6 K, indicating a signature of correlated electronic states in the WSe2/MoSe2 heterobilayer.