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arXiv 2107.07541cond-mat.mtrl-scicond-mat.mes-hall
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1T-MoS$_2$中Ni掺杂诱导重构、电子相及铁电性的多样呈现

Panoply of Ni-Doping-Induced Reconstructions, Electronic Phases, and Ferroelectricity in 1T-MoS$_2$

Rijan Karkee, David A. Strubbe

AI总结:

本研究理论揭示Ni掺杂可诱导单层1T-MoS$_2$形成多种重构与电子相,其中稳定的${3} \ imes {3}$纯相展现出远超1T$''$的铁电极化及多重带隙应用潜力。

摘要:

单层1T-MoS$_2$的畸变相具有独特的电子性质,在光电子学、催化和电池领域具有潜在应用。我们从理论上研究了利用Ni掺杂产生畸变1T相的方法,不仅发现了通常报道的相,还发现了另外两种相(${3} \ imes {3}$和${4} \ imes {4}$),这取决于掺杂浓度以及取代掺杂或吸附原子掺杂位点。去除掺杂剂后,相应的纯相保持稳定,这可能为实验合成提供一条潜在途径。我们发现了较大的铁电极化,最显著的是${3} \ imes {3}$相——与最近测量的1T$''$相比,其铁电极化高出100倍,能量更低,带隙更大。掺杂相包括奇异的多铁性半金属、铁电极性金属,以及仅面内极化可翻转的非本征铁电体。纯相在导带中具有不寻常的多重带隙,可能应用于中间带太阳能电池、透明导体和非线性光学。

英文摘要:

The distorted phases of monolayer 1T-MoS$_2$ have distinct electronic properties, with potential applications in optoelectronics, catalysis, and batteries. We theoretically investigate the use of Ni-doping to generate distorted 1T phases, and find not only the ones usually reported but also two further phases (${3} \times {3}$ and ${4} \times {4}$), depending on the concentration and the substitutional or adatom doping site. Corresponding pristine phases are stable after dopant removal, which might offer a potential route to experimental synthesis. We find large ferroelectric polarizations, most notably in ${3} \times {3}$ which -- compared to the recently measured 1T$''$ -- has 100 times greater ferroelectric polarization, a lower energy, and a larger bandgap. Doped phases include exotic multiferroic semimetals, ferromagnetic polar metals, and improper ferroelectrics with only in-plane polarization switchable. The pristine phases have unusual multiple gaps in the conduction bands, with possible applications for intermediate band solar cells, transparent conductors, and nonlinear optics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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