Mgnetic domain analysis using terahertz waves

通过记录1-7 meV能量范围内的复折射率，研究了PSMO(110)外延薄膜沿[1-10]和[001]两个不同的面内正交轴的低能电荷动力学。我们报道了一种新的观察，当极化的太赫兹激发场扫过正交面内轴时，从类Drude金属电导逐渐过渡到类电荷密度波(CDW)集体激发。这是高导条型电荷有序(CO)系统中CDW模式的罕见表现，它与棋盘CO的CDW模式有根本的不同。有趣的是，沿正交面内轴的对比电荷动力学形成了本征电子开关，这显然是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.