论文标题
HGTE无间隙量子井中狄拉克费米的量子运输
Quantum transport of Dirac fermions in HgTe gapless quantum wells
论文作者
论文摘要
我们研究具有关键井厚度的HGTE量子孔的运输特性，其中带隙封闭，低能谱由单个Dirac锥描述。在这项工作中，我们研究了宏观和微米大小的（中倍）样品。在微米大小的样品中，我们观察到一个磁场诱导的，量化的电阻（$ \ sim h/2e^{2} $）在landau填充因子$ν= 0 $上，对应于以电荷中性点（CNP）为中心的螺旋边缘状态的形成。在宏观样本中，接近零兰道水平（LL）的阻力揭示了强烈的振荡，我们将其归因于边缘$ν= 0 $ state and bulk $ v $ v \ neq 0 $ hole ll之间的散射。我们提供了一种模型，采用经验方法来基于储层场景（由重孔形成）构建LL图。
We study transport properties of HgTe quantum wells with critical well thickness, where the band gap is closed, and the low energy spectrum is described by a single Dirac cone. In this work, we examined both macroscopic and micron-sized (mesocopic) samples. In micron-sized samples, we observe a magnetic field induced, quantized resistance ($\sim h/2e^{2}$) at Landau filling factor $ν=0$, corresponding to the formation of helical edge states centered at the charge neutrality point (CNP). In macroscopic samples, the resistance near zero Landau level (LL) reveals strong oscillations, which we attribute to scattering between the edge $ν=0$ state and bulk $ν\neq 0$ hole LL. We provide a model taking an empirical approach to construct a LL diagram based on a reservoir scenario, formed by the heavy holes.
