论文标题
同位素纯化的$^{13} $ c石墨烯中核引起的超精细效应的dephasing和签名
Nuclear-induced dephasing and signatures of hyperfine effects in isotopically purified $^{13}$C graphene
论文作者
论文摘要
电子和核之间的超精细相互作用既是祝福又是诅咒。当用作实验探测技术时，它可以提供大量信息，但是当它充当电子系统上的扰动时，它也可能具有破坏性。在这项工作中，我们制造了大规模的单层和多层纯化的$^{13} $ c Graphene Hall棒，以搜索核磁矩和电子系统之间的相互作用效果。我们在分析弱定位现象的分析中发现了细胞核的特征，该现象在单层$^{12} $ c和$^{13} $ c chaphene cluseence cline dirac Point中显示出显着的二分法。利用微波诱导的电子自旋翻转将动量转移到核并堆积核场。非常弱的核场的存在被编码在电子Zeeman能量的调节中，该能量转移了共振剂吸收的能量并减少了$ G $ -FACTOR。
The hyperfine interaction between the spins of electrons and nuclei is both a blessing and a curse. It can provide a wealth of information when used as an experimental probing technique but it can also be destructive when it acts as a dephasive perturbation on the electronic system. In this work, we fabricated large scale single and multilayer isotopically-purified $^{13}$C graphene Hall bars to search for interaction effects between the nuclear magnetic moments and the electronic system. We find signatures of nuclei with a spin in the analysis of the weak localization phenomenon that shows a significant dichotomy in the scattering times of monolayer $^{12}$C and $^{13}$C graphene close the Dirac point. Microwave-induced electron spin flips were exploited to transfer momentum to the nuclei and build-up a nuclear field. The presence of a very weak nuclear field is encoded in a modulation of the electron Zeeman energy which shifts the energy for resonant absorption and reduces the $g$-factor.
