论文标题
3C-SIC中硅空位的稳定性和分解分析
Stability and decoherence analysis of the silicon vacancy in 3C-SiC
论文作者
论文摘要
我们研究3C SIC中的硅空置是量子技术领域感兴趣的颜色中心，重点是其与含有SI29和C13核的SIC核自旋浴的磁相互作用，其自然同位素浓度。我们基于密度功能理论，使用从头算法来计算系统的能量和磁性特性，从而将硅空位的中性电荷状态确定为最有利于P掺杂的3C SIC系统的中性电荷状态。因此，我们评估了与核自旋浴的电子自旋相互作用的自由感应衰减和Hahn回波序列。在这里，由于单个核自旋翻转过程，电子自旋回声包膜调制现象以及在群集相关扩展理论的背景下突出显示了整体衰减。我们发现一个非指数相干衰减，这是固态量子台的典型特征，该固态速度受到环境的低频1/f噪声。
We study the silicon vacancy in 3C SiC as a color center of interest in the field of Quantum Technologies, focusing on its magnetic interaction with the SiC nuclear spin bath containing Si29 and C13 nuclei in their natural isotopic concentration. We calculate the system energetic and magnetic properties with ab initio methods based on the Density Functional Theory, identifying the neutral charge state of the silicon vacancy as the most favorable for p doped 3C SiC systems. We thereon evaluate the Free Induction Decay and the Hahn echo sequence on the electron spin interacting with the nuclear spin bath. Here, the Electron Spin Echo Envelope Modulation phenomenon, due to single nuclear spin flipping processes, and the overall decay are highlighted in the context of the Cluster Correlation Expansion theory. We find a non exponential coherence decay, which is a typical feature of solid state qubits subjected to low frequency 1/f noise from the environment.
