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arXiv 2202.05948cond-mat.mes-hallcond-mat.mtrl-sci
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石墨烯中磁场可调的谷对比赝磁约束

Magnetic field-tunable valley-contrasting pseudomagnetic confinement in graphene

Ya-Ning Ren, Yu-Chen Zhuang, Qing-Feng Sun, Lin He

AI总结:

本研究利用应变石墨烯中的非均匀赝磁场实现无质量狄拉克费米子的量子约束,通过调节真实磁场打破两能谷有效磁场平衡,获得谷对比空间约束与可调谷极化受限态,为操控谷自由度提供新方法。

摘要:

引入量子约束已揭示了一系列丰富的有趣量子现象,使人们能够直接探测受限(准)粒子的物理特性。然而在大多数实验中,静电势是在连续系统中产生量子约束的唯一可用方法。本文通过实验证明,应变石墨烯中的非均匀赝磁场可对无质量狄拉克费米子产生奇特的量子约束。该赝磁场在石墨烯的两个不同能谷中方向相反。通过调节真实磁场,两个能谷中的总有效磁场变得不平衡。随后我们实现了谷对比空间约束,它解除了谷简并,并在石墨烯中产生了磁场可调的谷极化受限态。我们的研究结果为操控谷自由度提供了新途径。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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