标题： 石墨烯约瑟夫森结中拓扑安德烈夫带的完全层析成像 显示英文标题

标题： Full tomography of topological Andreev bands in graphene Josephson junctions

摘要： 具有通量管穿过的多连通电子网络被提出作为一种绝热量子输运和拓扑态的平台。多端约瑟夫森结（MTJJ）已被建议作为实现这一概念的途径。然而，MTJJ中的拓扑现象仍需通过实验研究。在这里，我们研究了三端石墨烯约瑟夫森结的人工拓扑能带结构。利用隧穿光谱和磁场闸门，我们捕捉到了随两个独立相位差变化的安德烈夫束缚态（ABS）能量谱的断层扫描图。该ABS谱显示出从带隙态到无带隙态的拓扑转变，类似于节线半金属的能带结构。我们的结果表明基于石墨烯的MTJJ在工程化高维能带拓扑方面的潜力。 显示英文摘要

摘要： Multiply connected electronic networks threaded by flux tubes have been proposed as a platform for adiabatic quantum transport and topological states. Multi-terminal Josephson junction (MTJJ) has been suggested as a pathway to realize this concept. Yet, the manifestations of topology in MTJJ remain open for experimental study. Here, we investigated the artificial topological band structure of three-terminal graphene Josephson junctions. Employing tunnelling spectroscopy and magnetic flux gates, we captured the tomography of the Andreev bound state (ABS) energy spectrum as a function of two independent phase differences. This ABS spectrum exhibits the topological transition from gapped to gapless states, akin to the band structure of nodal-line semimetals. Our results show the potential of graphene-based MTJJs for engineering band topologies in higher dimensions.