Two-dimensional (2D) metallic transition metal dichalcogenides (TMDCs) have attracted extensive interest in various fields owing to their unique electronic properties. However, studies on their transport properties and the modulation of these properties based on their band structure are limited. Herein, we studied the transport phenomena in 2D metallic 2H-NbSe₂ using experimental and theoretical approaches. The transport properties, including electrical conductivity (σ) and Seebeck coefficient (S), of mechanically exfoliated 2H-NbSe₂ nanosheets were measured. We observed field effect-dependent variations in σ and S of the 2H-NbSe₂ nanosheets. Theoretical calculations of the electronic band structures and estimations of the transport properties of 2D 2H-NbSe₂ crystals were conducted to verify and explain the experimental results. The superconducting transition temperature of the exfoliated NbSe₂ nanosheets validated the reliability of the sample preparation procedures and indicated the high quality of the samples. Our findings provide a basis for understanding the electrical properties of metallic TMDCs intended for various applications.

中文翻译：

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二维金属 2H-NbSe2 中的电输运现象：实验和理论研究


二维 （2D） 金属过渡金属硫化物 （TMDC） 由于其独特的电子特性而引起了各个领域的广泛兴趣。然而，对其传输特性和基于其能带结构的这些特性的调制的研究是有限的。在此，我们使用实验和理论方法研究了二维金属 2H-NbSe₂ 中的输运现象。测量了机械剥离的 2H-NbSe₂ 纳米片的传输特性，包括电导率 （σ） 和塞贝克系数 （S）。我们观察到 2H-NbSe₂ 纳米片的 σ 和 S 的场效应依赖性变化。对 2D 2H-NbSe 2 晶体的电子能带结构进行了理论计算，并估计了 2D 2H-NbSe₂ 晶体的输运特性，以验证和解释实验结果。剥离的 NbSe₂ 纳米片的超导转变温度验证了样品制备程序的可靠性，并表明样品的高质量。我们的研究结果为了解用于各种应用的金属 TMDC 的电气特性提供了基础。