Inducing and Manipulating Heteroelectronic States in a Single MoS_{2} Thin Flake

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Few-layer molybdenum disulfide (MoS2) exhibits unique electronic properties due to its layered structure.
• Controlling electronic states in 2D materials is crucial for next-generation electronic devices.
• Heterostructures offer tunable properties by combining different material functionalities.

Purpose of the Study:

• To investigate the induction of spatially separated electronic states in few-layer MoS2 via dual gating.
• To explore the coexistence and interaction of superconductivity and Shubnikov-de Haas (SdH) oscillations.
• To demonstrate the potential for creating novel superconducting transistor functionalities.

Main Methods:

• Dual-gate electrical biasing of a few-layer MoS2 flake.
• Characterization of electronic transport properties, including superconductivity and SdH oscillations.
• Analysis of Landau level degeneracy, electron effective mass, and carrier density.

Main Results:

• Spatially separated electronic states were induced, with superconductivity localized in the K/K' valleys of the top layer.
• Shubnikov-de Haas (SdH) oscillations originated from electrons in the Q/Q' valleys of the bottom layers.
• Electrical manipulation of heteroelectronic states enabled "bipolar-like" superconducting transistor operation with on-off-on switching.

Conclusions:

• Dual gating in few-layer MoS2 can engineer distinct electronic states, leading to emergent phenomena.
• The demonstrated tunable superconducting transistor behavior highlights the potential of MoS2 heterostructures.
• This work provides a pathway for designing advanced electronic and superconducting devices based on 2D materials.