论文标题
双层石墨烯量子点中单电子自旋态的脉冲胶质光谱
Pulsed-gate spectroscopy of single-electron spin states in bilayer graphene quantum dots
论文作者
论文摘要
石墨烯和双层石墨烯量子点是有前途的宿主，用于较长的连贯性时间。尽管最近的技术改进使得可以在双层石墨烯量子点中静电局限于单个电子，并且已经详细研究了单个粒子光谱的旋转和山谷质地，但它们的弛豫动力学仍然无法探索。在这里，我们报告了通过高频门控制的单电子双层石墨烯量子点传输的。通过单电子自旋状态的瞬时电流光谱，我们提取自旋松弛时间为0.5〜 $μ$ s的下限。该结果代表了研究基于石墨烯的量子点中自旋相干时间和自旋量子的实施的重要一步。
Graphene and bilayer graphene quantum dots are promising hosts for spin qubits with long coherence times. Although recent technological improvements make it possible to confine single electrons electrostatically in bilayer graphene quantum dots, and their spin and valley texture of the single particle spectrum has been studied in detail, their relaxation dynamics remains still unexplored. Here, we report on transport through a high-frequency gate controlled single-electron bilayer graphene quantum dot. By transient current spectroscopy of single-electron spin states, we extract a lower bound of the spin relaxation time of 0.5~$μ$s. This result represents an important step towards the investigation of spin coherence times in graphene-based quantum dots and the implementation of spin-qubits.
