Moirépotential profile can form flat electronic bands and manifest correlated states of electrons,where carrier doping is essential for observing those correlations.In this work,we uncover a hidden but remarkable...Moirépotential profile can form flat electronic bands and manifest correlated states of electrons,where carrier doping is essential for observing those correlations.In this work,we uncover a hidden but remarkable many-electron effect:doped carriers form a two-dimensional plasmon and strongly couple with quasiparticles to renormalize moirépotential and realize ultra-flat bands.Using many-body perturbation theory,we demonstrate this effect in twisted MoS_(2)/WS_(2) heterobilayer.The moirépotential is significantly enhanced upon carrier doping,and the bandwidth is reduced by order of magnitude,leading to drastic quenching of electronic kinetic energy and stronger correlation.We further predict that the competition between correlated mechanisms can be effectively controlled via doping,giving hope to a quantum transition between Mott and charge-transfer insulating states.Our work reveals that the potential renormalization effect of doping is much more significant in determining and controlling many-electron electronic correlations than sole filling-factor tuning in semiconducting moirécrystals.展开更多
基金We acknowledge valuable discussions with Yufeng Liang,Shiyuan Gao,and Xiaobo Lu.L.Z.and L.Y.are supported by the National Science Foundation(NSF)grant No.DMR-2124934H.W.is supported by the Air Force Office of Scientific Research(AFOSR)grant No.FA9550-20-1-0255This work uses the Extreme Science and Engineering Discovery Environment(XSEDE),which is supported by National Science Foundation(NSF)grant No.ACI-1548562.The authors acknowledge the Texas Advanced Computing Center(TACC)at The University of Texas at Austin for providing HPC resources.
文摘Moirépotential profile can form flat electronic bands and manifest correlated states of electrons,where carrier doping is essential for observing those correlations.In this work,we uncover a hidden but remarkable many-electron effect:doped carriers form a two-dimensional plasmon and strongly couple with quasiparticles to renormalize moirépotential and realize ultra-flat bands.Using many-body perturbation theory,we demonstrate this effect in twisted MoS_(2)/WS_(2) heterobilayer.The moirépotential is significantly enhanced upon carrier doping,and the bandwidth is reduced by order of magnitude,leading to drastic quenching of electronic kinetic energy and stronger correlation.We further predict that the competition between correlated mechanisms can be effectively controlled via doping,giving hope to a quantum transition between Mott and charge-transfer insulating states.Our work reveals that the potential renormalization effect of doping is much more significant in determining and controlling many-electron electronic correlations than sole filling-factor tuning in semiconducting moirécrystals.
