标题： 石墨烯中p-n结沿纵向的持续电流分布及磁场的影响 显示英文标题

标题： Persistent current distributions along a p-n junction in graphene in a magnetic field

摘要： 由门电压在石墨烯中诱导出的p-n结，用于对比其两侧电子和空穴的边缘态。在磁场中，这些边缘态携带两种持久电流，且与边缘模式的能谱密切相关。我们研究了当费米能级变化时，这些持久电流如何沿结的每一边发生变化，并特别关注狄拉克电子的电子-空穴共轭性质。我们还仔细研究了价带被负能电子填满的情况，即狄拉克海，整体上它表现为电学惰性，但显示出本征轨道反铁磁性。最近，在实验中，通过使用纳米尺度的磁力计，可以观察到平面样品中的局域电流。石墨烯及其相关原子层中的p-n结，通过检测相关的微观电流，将成为探索多体量子现象的一个有用平台。 显示英文摘要

摘要： A p-n junction, induced in graphene by gating, works to contrast the edge states of electrons and holes on each side of it. In a magnetic field those edge states carry two species of persistent current, which are intimately tied to the edge-mode spectra. We study how those persistent currents change along each side of the junction as the Fermi level is varied, with special emphasis on the electron-hole conjugation property of the Dirac electrons. A close look is made into the electromagnetic response of the valence band filled with negative-energy electrons, or the Dirac sea, which as a whole turns out to be electrically inactive while showing intrinsic orbital diamagnetism. Recently, in experiment, it became possible to observe local currents in planar samples by use of a nanoscale magnetometer. The p-n junctions in graphene and related atomic layers, via detection of associated microscopic currents, will be a useful platform for exploring many-body quantum phenomena.