论文标题
超薄MNPS中的线性磁电阶段$ _ {3} $由光学第二谐波探测
Linear magneto-electric phase in ultrathin MnPS$_{3}$ probed by optical second harmonic generation
论文作者
论文摘要
过渡金属硫代磷酸盐$ m $ ps $ _3 $（$ m $ = m = mn，fe，ni）是一类范德华，堆叠了绝缘抗铁磁铁，可以将其剥落至超薄限制。 MNPS $ _3 $特别有趣，因为它的n $ \急性{\ textrm {e}} $ elstored状态破坏了空间中的和时间反转的对称性，从而允许在范德瓦尔材料中罕见的线性磁磁性阶段。但是，尚不清楚这种散装MNPS $ _3 $的独特磁性结构是否在超薄极限内保持稳定。使用光学的第二次谐波生成旋转各向异性，我们表明远程线性磁电磁型n $ \急性{\ textrm {e}} $ el Order in MNPS $ _3 $中的订单持续至少为5.3 nm。然而，在SIO $ _2 $底物上，在散装材料中不存在的超薄样品中发生了不寻常的镜子对称性破裂，这可能与底物诱导的菌株有关。
The transition metal thiophosphates $M$PS$_3$ ($M$ = Mn, Fe, Ni) are a class of van der Waals stacked insulating antiferromagnets that can be exfoliated down to the ultrathin limit. MnPS$_3$ is particularly interesting because its N$\acute{\textrm{e}}$el ordered state breaks both spatial-inversion and time-reversal symmetries, allowing for a linear magneto-electric phase that is rare among van der Waals materials. However, it is unknown whether this unique magnetic structure of bulk MnPS$_3$ remains stable in the ultrathin limit. Using optical second harmonic generation rotational anisotropy, we show that long-range linear magneto-electric type N$\acute{\textrm{e}}$el order in MnPS$_3$ persists down to at least 5.3 nm thickness. However an unusual mirror symmetry breaking develops in ultrathin samples on SiO$_2$ substrates that is absent in bulk materials, which is likely related to substrate induced strain.
