Ga $^{2+}$中心自旋相关复合的电子-核自旋相关守恒
Electron-nucleus spin correlation conservation of the spin dependent recombination in Ga$^{2+}$ centers
摘要：
GaAsN中的自旋相关复合在自旋电子器件的设计中提供了许多有趣的可能性，主要是由于其在室温下达到接近100%的导带电子自旋极化的惊人能力。在本文中重新审视的自旋选择性捕获Ga $^{2+}$顺磁中心的电子背后的机制，以解决大多数以前提出的模型共同的不一致。首先，这些错误表现为与这种现象的两个关键特征的实验观察的主要分歧：有效的Overhauser样磁场和光致发光洛伦兹样曲线的宽度作为照明功率的函数。这些特性不仅是理解GaAsN中自旋相关复合的必要条件，而且也是设计新型自旋电子器件的关键。在这里，我们证明了电子捕获表达式的特定结构引入了虚假的电子-核相关性，人为地改变了超精细和塞曼贡献之间的平衡。这种不平衡强烈地扭曲了有效磁场和宽度特性。在这项工作中，我们提出了一种替代的复合机制，保留了电子-核的相关性，并在同一时间，保持了电子的自旋选择性捕获的基本属性。这种机制产生了显着的改善，实验和理论结果之间的协议。特别是，我们的模型给出的结果与实验的有效Overhauser类磁场和宽度数据，并与倾斜磁场下的圆极化度非常好地符合。
英文摘要：
Spin dependent recombination in GaAsN offers many interesting possibilities in the design of spintronic devices mostly due to its astounding capability to reach conduction band electron spin polarizations close to 100% at room temperature. The mechanism behind the spin selective capture of electrons in Ga$^{2+}$ paramagnetic centers is revisited in this paper to address inconsistencies common to most previously presented models. Primarily, these errors manifest themselves as major disagreements with the experimental observations of two key characteristics of this phenomenon: the effective Overhauser-like magnetic field and the width of the photoluminescence Lorentzian-like curves as a function of the illumination power. These features are not only essential to understand the spin dependent recombination in GaAsN, but are also key to the design of novel spintronic devices. Here we demonstrate that the particular structure of the electron capture expressions introduces spurious electron-nucleus correlations that artificially alter the balance between the hyperfine and the Zeeman contributions. This imbalance strongly distorts the effective magnetic field and width characteristics. In this work we propose an alternative recombination mechanism that preserves the electron-nucleus correlations and, at the same time, keeps the essential properties of the spin selective capture of electrons. This mechanism yields a significant improvement to the agreement between experimental and theoretical results. In particular, our model gives results in very good accord with the experimental effective Overhauser-like magnetic field and width data, and with the degree of circular polarization under oblique magnetic fields.
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