Dion-Jacobson相的二維（2-D）鈣鈦礦材料Ca2Nan-3NbnO3n+1-（CNNO）奈米結構因其獨特光電性質，所以具有通過光電化學水分解產生氫的潛力。 在本論文中，我們已經成功的製備了具有n = 4、5和6的不同分子厚度的CNNO二維奈米片。同時，研究CNNO奈米片應用於太陽能水分解電池的可行性，並且同時研究包含使用相干的圓形偏振光ħ/-ħ進行自旋電子水分解和斯格明子（Skyrmion)計算自旋電子學的應用。
斯格明子是具有拓撲穩定性的自旋旋渦的準粒子，可以保持自旋電子的狀態，並深具有潛能應用於載流子信息於下一代自旋電子裝置。磁性斯格明子可以在室溫下生成，其原理由CNNO奈米片中存在著Nb4 +和Nb5 +兩種不同價態而產生雙重交換的機制一個是由於自旋軌道耦合（SOC）對稱性破壞後而引起的Dzyaloshinskii-Moriya相互作用（DMI），故使 CNNO 4奈米片表現出弱的鐵磁性，而CNNO 5和CNNO 6奈米片表現出超順磁性。在不需施加外部磁場的情況下，即可使二維奈米片清楚地觀察到磁性斯格明子現象發生。使用第一原理計算和微磁模擬，可以觀察到磁性斯格明子中有直徑為11-15 nm Néel型的斯格明子存在於CNNO奈米片中，且與實驗結果互相吻合。自旋電子保持在斯格明子磁性拓撲態中會引起氫氣的還原反應，並且可用於未來的能源產生設備中。

A well-crystalline two-dimensional (2-D) perovskite material, Ca2Nan-3NbnO3n+1- (CNNO) nanosheets, derived from the Dion-Jacobson phase has the potential to generate hydrogen through photoelectrochemical water splitting and become the prominent candidate for future spintronic devices. Here, we have successfully fabricated CNNO nanosheets with the different molecular thickness of n = 4, 5, and 6. We investigate not only the feasibility of CNNO nanosheets to be used in solar water-splitting cells, but also spintronic-based applications such as spintronic water splitting and skyrmion computing using coherent circularly ħ/-ħ polarization light.
A skyrmion is a quasiparticle with the topologically stable spin swirls to hold the state of the spin electrons with a potential application as carrier information and holds promises for realizing the next-generation spintronic devices. The magnetic skyrmion can be generated at room temperature and the mechanism comes from two reasons, one is Dzyaloshinskii–Moriya interaction (DMI) happened because of the symmetry breaking of spin-orbit coupling (SOC), and another one is double exchange mechanism that comes from the presence of two valence state of Nb4+ and Nb5+ in CNNO nanosheets. The CNNO4 nanosheets exhibit weak ferromagnetic while CNNO5 and CNNO6 nanosheets exhibit superparamagnetic. The magnetic skyrmion can be clearly observed in those 2D nanosheets without the application of the external magnetic field. Using first-principles calculation and micromagnetic simulation, the magnetic skyrmion in CNNO nanosheets shows Néel-type skyrmion with a diameter of 11-15 nm which is corresponding to the experimental results. The spin electron hold in the topological state of magnetic skyrmion causes reduction reaction of hydrogen gas. Our findings provide insights toward developing room-temperature skyrmion in CNNO nanosheets for future energy generation devices.

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