论文标题
石墨烯中的磁场可调谷对抗性伪磁限量
Magnetic field-tunable valley-contrasting pseudomagnetic confinement in graphene
论文作者
论文摘要
引入量子限制已经发现了一系列有趣的量子现象，并允许人们直接探测约束（准）颗粒的物理。但是，在大多数实验中，静电电位是在连续系统中生成量子限制的唯一可用方法。在这里，我们在实验上证明了细菌石墨烯中的不均匀伪磁场可以引入无质量的dirac费米子的外来量子限制。假磁场在石墨烯的两个不同山谷中具有相反的方向。通过调整实际磁场，两个山谷中的总有效磁场会失衡。然后，我们意识到了山谷对抗性的空间禁闭，从而提高了山谷的堕落，并导致了石墨烯中的田间可调山谷极化的约束状态。我们的结果为操纵山谷的自由度提供了新的途径。
Introducing quantum confinement has uncovered a rich set of interesting quantum phenomena and allows one to directly probe the physics of confined (quasi-)particles. In most experiments, however, electrostatic potential is the only available method to generate the quantum confinement in a continuous system. Here, we demonstrated experimentally that inhomogeneous pseudomagnetic fields in strained graphene can introduce exotic quantum confinement of massless Dirac fermions. The pseudomagnetic fields have opposite directions in the two distinct valleys of graphene. By tuning real magnetic field, the total effective magnetic fields in the two valleys are imbalanced. Then, we realized valley-contrasting spatial confinement, which lifts the valley degeneracy and results in field-tunable valley-polarized confined states in graphene. Our results provide a new avenue to manipulate the valley degree of freedom.
