Measuring Band Modulation of MoS<sub>2</sub> with Ferroelectric Gates.

Sun, Xinzuo; Chen, Yan; Zhao, Dongyang; Taniguchi, Takashi; Watanabe, Kenji; Wang, Jianlu; Xue, Jiamin · Nano Lett · 2023

basic_science · Level V

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Abstract

Electronic properties of two-dimensional (2D) materials can be significantly tuned by an external electric field. Ferroelectric gates can provide a strong polarization electric field. Here, we report the measurements of the band structure of few-layer MoS<sub>2</sub> modulated by a ferroelectric P(VDF-TrFE) gate with contact-mode scanning tunneling spectroscopy. When P(VDF-TrFE) is fully polarized, an electric field up to ∼0.62 V/nm through the MoS<sub>2</sub> layers is inferred from the measured band edges, which affects the band structure significantly. First, strong band bending in the vertical direction signifies the Franz-Keldysh effect and a large extension of the optical absorption edge. Photons with energy of half the band gap are still absorbed with 20% of the absorption probability of photons at the band gap. Second, the electric field greatly enlarges the energy separations between the quantum-well subbands. Our study intuitively demonstrates the great potential of ferroelectric gates in band structure manipulation of 2D materials.