论文标题
拓扑山谷电流通过弹道边缘模式在主要狄拉克点附近的石墨烯超晶格中
Topological valley currents via ballistic edge modes in graphene superlattices near the primary Dirac point
论文作者
论文摘要
六角硼硝化硼（HBN）上的石墨烯可以通过相互晶体学比对表现出拓扑阶段。在弹道石墨烯/HBN超级晶格中，在次级狄拉克点（SDP）附近的非局部电阻（$ r_ {nl} $）的最新测量已被解释为由于量子谷霍尔州而引起的。我们报告HBN/Chaphene/HBN超级晶格，其中SDP的$ R_ {NL} $可以忽略不计，但低于60 K以下的零磁场的$ H/2E^{2} $的值为Dirac Point的零磁场的特征衰减长度为2 $μ$ m。此外，基于Landauer-Büttiker形式主义的非本地运输传输概率显示了自旋排定弹道Valley山谷螺旋螺旋模式的证据，这是开发Valleytronics的关键
Graphene on hexagonal boron nitride (hBN) can exhibit a topological phase via mutual crystallographic alignment. Recent measurements of nonlocal resistance ($R_{nl}$) near the secondary Dirac point (SDP) in ballistic graphene/hBN superlattices have been interpreted as arising due to the quantum valley Hall state. We report hBN/graphene/hBN superlattices in which $R_{nl}$ at SDP is negligible, but below 60 K approaches the value of $h/2e^{2}$ in zero magnetic field at the primary Dirac point with a characteristic decay length of 2 $μ$m. Furthermore, nonlocal transport transmission probabilities based on the Landauer-Büttiker formalism show evidence for spin-degenerate ballistic valley-helical edge modes, which are key for the development of valleytronics
