论文标题
在强型自旋轨道耦合的2D电子气体中的界面状态的回旋共振的测量值
Measurements of cyclotron resonance of the interfacial states in strong spin-orbit coupled 2D electron gases proximitized with aluminum
论文作者
论文摘要
INAS量子井中铝制二维电子气体（2DEG）是铝制量化的量子孔，是基于Majorana零模式的拓扑量表的有前途的平台。但是，仍然存在与这些系统界面上电子状态的性质相关的实质性不确定性。探测这些杂交状态的性质是具有挑战性的，因为它们被埋在相对较厚的铝层下。在这项工作中，我们研究了一系列INAS/IN $ _ {1- \ text {x}} $ ga $ _ \ text {x} $作为异构结构，并使用高精度时差异谱图。尽管有厚的金属叠加剂，但我们观察到磁场中的显着回旋共振，这可以与界面状态的响应有关。 THZ范围复合式旋转的测量值可以提取有效质量的符号和幅度，电荷载体的密度以及2DEG的散射时间，尽管铝层接近。我们讨论提取的频带参数，并将其值与这些材料的已知物理学联系起来。
Two-dimensional electron gasses (2DEG) in InAs quantum wells proximitized by aluminum are promising platforms for topological qubits based on Majorana zero modes. However, there are still substantial uncertainties associated with the nature of the electronic states at the interfaces of these systems. It is challenging to probe the properties of these hybridized states as they are buried under a relatively thick aluminum layer. In this work, we have investigated a range of InAs/In$ _{1-\text{x}} $Ga$ _\text{x} $As heterostructures with Al overlayers using high precision time-domain THz spectroscopy. Despite the thick metallic overlayer, we observe a prominent cyclotron resonance in the magnetic field that can be associated with the response of the interfacial states. Measurements of the THz range complex Faraday rotation allow the extraction of the sign and magnitude of the effective mass, the density of charge carriers, and scattering times of the 2DEG despite the close proximity of the aluminum layer. We discuss the extracted band parameters and connect their values to the known physics of these materials.
