标题： 单电子双层石墨烯量子点中的自旋弛豫 显示英文标题

标题： Spin relaxation in a single-electron bilayer graphene quantum dot

摘要： 我们研究了由于自旋轨道耦合而在单电子双层石墨烯量子点中的自旋弛豫。 自旋弛豫通过键长变化和变形势机制以及电荷噪声$1/f$辅助声子发射而得到促进。在自旋弛豫率$T_1^{-1}$的垂直磁场依赖性中，我们预测了在较高场强下$T_1^{-1}$将单调增加，在此情况下，通过变形势的电子-声子耦合在自旋弛豫中起主导作用。 由于键长变化引起的电子-声子耦合与$1/f$电荷噪声之间的竞争，在较低磁场下的$T_1^{-1}$中显示了一个不太显著的凹陷。 最后，报告了自旋弛豫的磁场依赖性与 Banszerus 等人 [Nat. Commun. 13, 3637 (2022)] 和 Gächter 等人 [PRX Quantum 3, 020343 (2022)] 进行的现有实验的详细比较。 显示英文摘要

摘要： We study the spin relaxation in a single-electron bilayer graphene quantum dot due to the spin-orbit coupling. The spin relaxation is assisted by the emission of acoustic phonons via the bond-length change and deformation potential mechanisms and $1/f$ charge noise. In the perpendicular magnetic-field dependence of the spin relaxation rate $T_1^{-1}$, we predict a monotonic increase of $T_1^{-1}$ at higher fields where the electron-phonon coupling via the deformation potential plays a dominant role in spin relaxation. We show a less pronounced dip in $T_1^{-1}$ at lower magnetic fields due to the competition between the electron-phonon coupling due to bond-length change and $1/f$ charge noise. Finally, detailed comparisons of the magnetic-field dependence of the spin relaxation with the existing experiments by Banszerus et al. [Nat. Commun. 13, 3637 (2022)] and G\"achter et al. [PRX Quantum 3, 020343 (2022)] are reported.