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Bilayer Quantum Hall States in an n-Type Wide Tellurium Quantum Well #MMPMID34514803
Niu C; Qiu G; Wang Y; Si M; Wu W; Ye PD
Nano Lett 2021[Sep]; 21 (18): 7527-7533 PMID34514803show ga
Tellurium (Te) is a narrow bandgap semiconductor with a unique chiral crystal structure. The topological nature of electrons in the Te conduction band can be studied by realizing n-type doping using atomic layer deposition (ALD) technique on two-dimensional (2D) Te film. In this work, we fabricated and measured the double-gated n-type Te Hall-bar devices, which can operate as two separate or coupled electron layers controlled by the top gate and back gate. Profound Shubnikov-de Haas (SdH) oscillations are observed in both top and bottom electron layers. Landau level hybridization between two layers, compound and charge-transferable bilayer quantum Hall states at filling factor nu = 4, 6, and 8, are analyzed. Our work opens the door for the study of Weyl physics in coupled bilayer systems of 2D materials.