论文标题
石墨烯Fabry-Perot干涉仪中的边缘通道
Edge channels in a graphene Fabry-Perot interferometer
论文作者
论文摘要
石墨烯Fabry-Pérot干涉仪中电子磁转运的量子力学计算介绍了边缘通道的空间结构的作用。对于通过去除碳原子而制造的干涉仪，通常在纳米光刻实验中实现碳原子，表明收缩会导致强烈的通道间散射，从而建立局部平衡并使电子传输非绝热。然而，两末端电导揭示了一种常见的aharonov-bohm振荡模式，独立于晶体学取向，晶体学取向伴随着单粒子状态，这些状态横向沿沿设备物理边界循环的边缘通道扫除费米能。干涉仪的限制容纳了可能缩短设备或破坏振荡模式的局部状态。对于通常在分裂实验中进行的静电限制产生的干涉仪，如果将交错的电势额外引入模型，则显示电子传输是绝热的。干扰可见性在低温下的温度呈指数衰减，依赖性较弱。
Quantum-mechanical calculations of electron magnetotransport in graphene Fabry-Pérot interferometers are presented with a focus on the role of spatial structure of edge channels. For an interferometer that is made by removing carbon atoms, which is typically realized in nanolithography experiments, the constrictions are shown to cause strong inter-channel scattering that establishes local equilibrium and makes the electron transport non-adiabatic. Nevertheless, two-terminal conductance reveals a common Aharonov-Bohm oscillation pattern, independent of crystallographic orientation, which is accompanied by single-particle states that sweep through the Fermi energy for the edge channels circulating along the physical boundary of the device. The interferometer constrictions host the localized states that might shorten the device or disrupt the oscillation pattern. For an interferometer that is created by electrostatic confinement, which is typically done in the split-gate experiments, electron transport is shown to be adiabatic if the staggered potential is introduced additionally into the model. Interference visibility decays exponentially with temperature with a weaker dependence at low temperature.
