论文标题
量子霍尔铁电和义工的局部探针
Local Probes for Quantum Hall Ferroelectrics and Nematics
论文作者
论文摘要
在存在强定量磁场的情况下，二维多谷电子系统中，单个口袋的分散体具有低对称性，从而产生量子霍尔铁电和nematic状态。我们研究了这些状态的局部特征，这些状态几乎可以通过扫描隧道显微镜（STM）光谱进行探测。对于量子霍尔铁电体，我们证明了在杂质结合状态下测得的偶极矩与从现代极化理论获得的理想散装偶极矩之间的直接关系。我们还通过精确的对角线化研究了单个杂质的多体问题，发现近杂质的非平凡激子状态可以具有特定特征形成，可以通过STM光谱易于识别。
Two-dimensional multi-valley electronic systems in which the dispersion of individual pockets has low symmetry give rise to quantum Hall ferroelectric and nematic states in the presence of strong quantising magnetic fields. We investigate local signatures of these states arising near impurities that can be probed via Scanning Tunnelling Microscopy (STM) spectroscopy. For quantum Hall ferroelectrics, we demonstrate a direct relation between the dipole moment measured at impurity bound states and the ideal bulk dipole moment obtained from the modern theory of polarisation. We also study the many-body problem with a single impurity via exact diagonalization and find that near strong impurities non-trivial excitonic state can form with specific features that can be easily identified via STM spectroscopy.
