Correlated insulating states at fractional fillings of the WS2/WSe2 moire lattice

被引:243
作者
Huang, Xiong [1 ,2 ]
Wang, Tianmeng [3 ]
Miao, Shengnan [3 ]
Wang, Chong [4 ]
Li, Zhipeng [3 ]
Lian, Zhen [3 ]
Taniguchi, Takashi [5 ]
Watanabe, Kenji [6 ]
Okamoto, Satoshi [7 ]
Xiao, Di [4 ]
Shi, Su-Fei [3 ,8 ]
Cui, Yong-Tao [1 ]
机构
[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Dept Mat Sci & Engn, Riverside, CA 92521 USA
[3] Rensselaer Polytech Inst, Dept Chem & Biol Engn, Troy, NY 12180 USA
[4] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
[5] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, Tsukuba, Ibaraki, Japan
[6] Natl Inst Mat Sci, Funct Mat Res Ctr, Tsukuba, Ibaraki, Japan
[7] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA
[8] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA
关键词
WIGNER CRYSTAL; SIMULATION; MOTT;
D O I
10.1038/s41567-021-01171-w
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The strong electron interactions in the minibands formed in moire superlattices of van der Waals materials, such as twisted graphene and transition metal dichalcogenides, make such systems a fascinating platform with which to study strongly correlated states(1-19). In most systems, the correlated states appear when the moire lattice is filled by an integer number of electrons per moire unit cell. Recently, correlated states at fractional fillings of 1/3 and 2/3 holes per moire unit cell have been reported in the WS2/WSe2 hetero-bilayer, hinting at the long-range nature of the electron interaction(16). Here we observe a series of correlated insulating states at fractional fillings of the moire minibands on both electron- and hole-doped sides in angle-aligned WS2/WSe2 hetero-bilayers, with certain states persisting at temperatures up to 120 K. Simulations reveal that these insulating states correspond to ordering of electrons in the moire lattice with a periodicity much larger than the moire unit cell, indicating a surprisingly strong and long-range interaction beyond the nearest neighbours.
引用
收藏
页码:715 / +
页数:15
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