半金属单层CrTe中的室温铁电性、铁磁性和反常霍尔效应
Room Temperature Ferroelectricity, Ferromagnetism, and Anomalous Hall Effect in Half-metallic Monolayer CrTe
AI总结：
研究证明单层CrTe在室温以上具有动力学稳定的多铁性，结合铁磁性、半金属性、铁电性及磁电耦合，并实现电场可调谐的反常霍尔效应，在自旋电子学领域具应用潜力。
摘要：
具有铁电性和铁磁性的二维材料对于低功耗和高速信息处理技术至关重要。然而，在单层极限下的本征二维多铁性材料十分罕见。在此，我们证明通过解理[002]表面获得的单层CrTe在室温以上的温度下是动力学稳定的多铁性材料。我们表明它具有显著的平面内磁晶各向异性并发生铁磁有序，且是一个具有大半金属能隙的半金属。值得注意的是，单层CrTe破缺的反演对称性和弯曲几何结构使其成为具有大自发面外极化和显著磁电耦合的铁电体。此外，我们展示了极化或电场诱导的反常霍尔效应的可调谐性，并伴随着显著的能带结构调制。我们的研究结果确立了单层CrTe作为室温多铁性材料的地位，在自旋电子学和铁电器件中具有巨大应用潜力。
英文摘要：
Two-dimensional materials hosting ferroelectricity and ferromagnetism are crucial for low-power and high-speed information processing technologies. However, intrinsic 2D multiferroics in the monolayer limit are rare. Here, we demonstrate that monolayer CrTe, obtained by cleaving the [002] surface, is dynamically stable multiferroic at temperatures beyond room temperature. We show that it orders ferromagnetically with significant in-plane magnetocrystalline anisotropy, and it is a half-metal featuring a large half-metal gap. Remarkably, the broken inversion symmetry and buckled geometry of monolayer CrTe make it a ferroelectric with a large spontaneous out-of-plane polarization and significant magnetoelectric coupling. In addition, we demonstrate polarization or electric field-induced tunability of the anomalous Hall effect, accompanied by substantial bandstructure modulation. Our findings establish monolayer CrTe as a room-temperature multiferroic with great potential for applications in spintronics and ferroelectric devices.
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