Mgnetic domain analysis using terahertz waves

通过记录1- 7 meV的复折射率，研究了PSMO（110）外延膜沿两个不同的平面内正交轴[1-10]和[001]的低能电荷动力学。我们报告了一个新的观察，从德鲁德类金属电导率逐渐交叉到电荷密度波（CDW）类集体激发，当极化太赫兹激发场扫过正交平面轴。这是一个罕见的CDW模式在高导电条纹型电荷有序（CO）系统的表现，它从根本上不同于棋盘状CO的CDW模式。有趣的是，沿着正交平面内轴的对比电荷动力学形成了一个固有的电子开关，显然是PSMO独特的CO的结果。

Low-energy charge dynamics in PSMO (110) epitaxial film were investigated along and across two dissimilar in-plane orthogonal axes, [1-10] and [001], by recording the complex refractive index in the energy range of 1 - 7 meV. We report a novel observation of a gradual crossover from Drude-like metallic conductivity to charge-density-wave (CDW) like collective excitations as the polarized terahertz excitation field is swept across the orthogonal in-plane axes. This is a rare manifestation of a CDW mode in a highly conducting stripe-type charge-ordered (CO) system, which is fundamentally different from the CDW modes of checkerboard CO. Interestingly, the contrasting charge dynamics along orthogonal in-plane axes form an intrinsic electronic switch, apparently a consequence of the unique CO of PSMO.