Switching the Moiré Lattice Models in the Twisted Bilayer WSe2 by Strain or Pressure

Gao，Yifan1; Xu，Qiaoling2; Farooq，M. Umar1; Xian，Lede2,3,4; Huang，Li1,5

2023

10.1021/acs.nanolett.3c01756

Nano Letters   Impact Factor & Quartile

1530-6984

1530-6992

Moiré superlattices of twisted van der Waals heterostructures provide a promising and tunable platform for simulating correlated two-dimensional physical models. In twisted bilayer transition-metal dichalcogenides with twist angles close to 0°, the Γ and K valley moiré bands are described by the honeycomb and the triangular effective lattice models, respectively, with distinct physics. Using large-scale first-principles calculations, we show that in-plane biaxial strain and out-of-plane pressure provide effective knobs for switching the moiré lattice models that emerged at the band edges in twisted bilayer WSe by shifting the energy positions of the Γ and K valley minibands. The shifting mechanism originates from the differences in the orbital characters of the Γ and K valley states and their responses to strain and pressure. The critical strain and pressure for switching the Γ/K valleys are 2.11% and 2.175 GPa, respectively.

biaxial strain moiré superlattice pressure quantum simulation transition-metal dichalcogenides valleytronics

SCI

English

NI Journal Papers

First ; Corresponding

National Key Research and Development Program of China[2022YFA1403501] ; Key-Area Research and Development Program of Guangdong Province of China[2020B0101340001] ; Ministry of Science and Technology of the People's Republic of China[2022B1212010008] ; Open Project of Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices[KF2021003] ; null[2022YFA1402903]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001049440300001

AMER CHEMICAL SOC

MATERIALS SCIENCE

2-s2.0-85169309236

Scopus

1.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Songshan Lake Materials Laboratory,Dongguan,Guangdong,523808,China
3.Max Planck Institute for the Structure and Dynamics of Matter,Center for Free Electron Laser Science,Hamburg,22761,Germany
4.Hefei National Research Center for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei,Anhui,230026,China
5.Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area (Guangdong),Shenzhen,518045,China

Gao，Yifan,Xu，Qiaoling,Farooq，M. Umar,et al. Switching the Moiré Lattice Models in the Twisted Bilayer WSe2 by Strain or Pressure[J]. Nano Letters,2023,23(17).

Gao，Yifan,Xu，Qiaoling,Farooq，M. Umar,Xian，Lede,&Huang，Li.(2023).Switching the Moiré Lattice Models in the Twisted Bilayer WSe2 by Strain or Pressure.Nano Letters,23(17).

Gao，Yifan,et al."Switching the Moiré Lattice Models in the Twisted Bilayer WSe2 by Strain or Pressure".Nano Letters 23.17(2023).