论文标题
部分可观测时空混沌系统的无模型预测
Long-Range Electron Transport in Prussian Blue Analog Nanocrystals
论文作者
论文摘要
我们通过纳米尺度设备报告了电子传输测量值，该纳米级设备由1至3个普鲁士蓝色模拟（PBA）纳米晶体组成，这些纳米晶体连接在两个电极之间。我们比较了两种类型的立方纳米晶体，分别是CSCOFE（15 nm）和CSNICR（6 nm），它们沉积在高度取向的热解石墨上，并通过导电AFM接触。测得的电流显示出指数依赖性，其长度为PBA纳米设备（高达45 nm），较低的衰减因子\ b {eta}在0.11-0.18 nm-1和0.18 nm-1和0.25-0.25-0.34 nm-1的范围内，分别为CSCOFE和CSINICR纳米晶体。从单个纳米颗粒制成的纳米尺度设备的电流曲线的理论分析中，我们推断出电子传输是在两种情况下从电极Fermi能量的0.5 eV的局部d频段介导的。通过与先前报道的AB-Initio计算相比，我们暂定将所涉及的轨道确定为CSCOFE的填充Fe（II）-T2G D频段（HOMO），而CSNICR的半填充Ni（II）-EG D频段（SOMO）。在相邻PBA之间的多纳米颗粒纳米尺度设备（电极之间的2和3纳米晶体）测量的电导值（电极之间的2和3纳米晶体）与多步相干隧道一致，相邻PBA之间的非谐振制度，一个简单的模型在相互的耦合之间得到了强耦合（约为0.1-0.25 ev）的相互作用（约为0.1-0.25 ev）。
We report electron transport measurements through nano-scale devices consisting of 1 to 3 Prussian blue analog (PBA) nanocrystals connected between two electrodes. We compare two types of cubic nanocrystals, CsCoFe (15 nm) and CsNiCr (6 nm), deposited on highly oriented pyrolytic graphite and contacted by conducting-AFM. The measured currents show an exponential dependence with the length of the PBA nano-device (up to 45 nm), with low decay factors \b{eta}, in the range 0.11 - 0.18 nm-1 and 0.25 - 0.34 nm-1 for the CsCoFe and the CsNiCr nanocrystals, respectively. From the theoretical analysis of the current-voltage curve for the nano-scale device made of a single nanoparticle, we deduce that the electron transport is mediated by the localized d bands at around 0.5 eV from the electrode Fermi energy in the two cases. By comparison with previously reported ab-initio calculations, we tentatively identify the involved orbitals as the filled Fe(II)-t2g d band (HOMO) for CsCoFe and the half-filled Ni(II)-eg d band (SOMO) for CsNiCr. Conductance values measured for multi-nanoparticle nano-scale devices (2 and 3 nanocrystals between the electrodes) are consistent with a multi-step coherent tunneling in the off-resonance regime between adjacent PBAs, a simple model gives a strong coupling (around 0.1 - 0.25 eV) between the adjacent PBA nanocrystals, mediated by electrostatic interactions.
