Göbel Börge, Mertig Ingrid
Institut für Physik, <a href="https://ror.org/05gqaka33">Martin-Luther-Universität Halle-Wittenberg</a>, D-06099 Halle (Saale), Germany.
Phys Rev Lett. 2024 Oct 4;133(14):146301. doi: 10.1103/PhysRevLett.133.146301.
The quantum Hall effect emerges when two-dimensional samples are subjected to strong magnetic fields at low temperatures: Topologically protected edge states cause a quantized Hall conductivity in multiples of e^{2}/h. Here we show that the quantum Hall effect is accompanied by an orbital Hall effect. Our quantum mechanical calculations fit well the semiclassical interpretation in terms of "skipping orbits." The chiral edge states of a quantum Hall system are orbital polarized akin to a hypothetical orbital version of the quantum anomalous Hall effect in magnetic systems. The orbital Hall resistivity scales quadratically with the magnetic field, making it the dominant effect at high fields.
当二维样品在低温下受到强磁场作用时，量子霍尔效应就会出现：拓扑保护的边缘态会导致以(e^{2}/h)的倍数为单位的量子化霍尔电导率。在此我们表明，量子霍尔效应伴随着轨道霍尔效应。我们的量子力学计算与基于“跳轨”的半经典解释非常吻合。量子霍尔系统的手性边缘态类似于磁性系统中量子反常霍尔效应的假设轨道版本那样发生轨道极化。轨道霍尔电阻率与磁场呈二次方关系，这使得它在高磁场下成为主导效应。
