论文标题
扫描隧道显微镜研究原子薄1T-TAS $ _2 $中隐藏相的隐藏相研究
Scanning tunneling microscopy study of hidden phases in atomically thin 1T-TaS$_2$
论文作者
论文摘要
由于变薄而引起的较低的热稳定性通常会导致低维材料中前所未有的隐藏相。这种隐藏的阶段可以共存或与先前存在的电子相竞争。我们研究了在原子薄（6-8层）1T-TAS $ _2 $的隐藏相，并使用扫描隧道显微镜进行了观察。首先，我们可以在室温下电气诱导隐藏的条纹阶段。这样的单轴条纹阶段通过打破1T-TAS $ _2 $的三重对称性，具有三个等效方向。我们还揭示了与电荷密度波相几乎相称的隐藏条纹相交的。接下来，我们观察到，紧急条纹阶段自发出现，而没有任何电动薄片上的电动激发（$ 160 \ times80 $ nm $^2 $）。我们的发现可能为先前观察到的相变和在室温下的1T-TAS $ _2 $设备中的两倍的光学响应提供了合理的解释。此外，隐藏的条纹阶段对于了解潜在应用的1T-TAS $ _2 $中的外来CDW现象至关重要。
Lower thermal stability due to thinning often leads to unprecedented hidden phases in low-dimensional materials. Such hidden phases can coexist or compete with preexisting electronic phases. We investigate hidden phases observed in atomically thin (6-8 layers) 1T-TaS$_2$ with scanning tunneling microscopy. First, we can electrically induce a hidden stripe phase at room temperature. Such a uniaxial stripe phase has three equivalent orientations by breaking three-fold symmetry of 1T-TaS$_2$. We also reveal that the hidden stripe phase coexists with nearly commensurate charge-density-wave phase. Next, we observe that the emergent stripe phase spontaneously appears without any electric excitation on a tiny flake ($160\times80$ nm$^2$). Our findings may provide a plausible explanation for the previously observed phase transition and two-fold optical response in thin 1T-TaS$_2$ devices at room temperature. Furthermore, the hidden stripe phase would be crucial to understand exotic CDW-related phenomena in 1T-TaS$_2$ for potential applications.
