论文标题
石墨烯中的可调Fabry-Pérot量子厅干涉仪
A tunable Fabry-Pérot quantum Hall interferometer in graphene
论文作者
论文摘要
量子厅边缘通道的电子干涉法具有探测和利用非亚伯里亚人的外来交换统计的希望。然而，在半导体异质结构中，量子霍尔干涉法已被证明具有挑战性，并且经常被充电效应所掩盖。在这里，我们表明，配备了一系列栅极可调量子点接触的高弹性单层石墨烯，这些量子触点充当电子束式刺激器，提供了一种模型系统，以执行Fabry-Pérot量子霍尔干涉法。我们观察到高可见性Aharonov-bohm干扰没有充电效应，并且与理论相当一致，可以通过静电门控或磁场进行广泛调节。在$ 0.02 $ k的温度下，连贯的长度为$ \ mathbf {10 \，μm} $，使我们能够进一步实现连贯耦合的双Fabry-Pérot干涉法。我们的结果为量子厅干涉法和拓扑激励开辟了新的途径，以进行量子计算。
Electron interferometry with quantum Hall edge channels holds promise for probing and harnessing exotic exchange statistics of non-Abelian anyons. In semiconductor heterostructures, however, quantum Hall interferometry has proven challenging and often obscured by charging effects. Here we show that high-mobility monolayer graphene equipped with a series of gate-tunable quantum point contacts that act as electron beam-splitters provides a model system to perform Fabry-Pérot quantum Hall interferometry. We observe high-visibility Aharonov-Bohm interference free of charging effects and widely tunable through electrostatic gating or magnetic field, in remarkable agreement with theory. A coherence length of $\mathbf{10 \,μm}$ at a temperature of $0.02$ K allows us to further achieve coherently-coupled double Fabry-Pérot interferometry. Our results open a new avenue for quantum Hall interferometry and the exploitation of topological excitations for quantum computation.
