Publications by authors named "Andreas Budewitz"
Article Synopsis
- The study explores how quantum spin Hall edge channels behave under strong magnetic fields, revealing that the expected transport gap does not appear in disordered topological insulators.
- Instead, researchers find that a topological edge channel exists alongside a counterpropagating quantum Hall edge channel even in strong fields.
- By adjusting disorder from fabrication methods, the research suggests that the observed quantum Hall edge channels are linked to a network of charge puddles at the device's edges.
The realization of the quantum spin Hall effect in HgTe quantum wells has led to the development of topological materials, which, in combination with magnetism and superconductivity, are predicted to host chiral Majorana fermions. However, the large magnetization in conventional quantum anomalous Hall systems makes it challenging to induce superconductivity. Here, we report two different emergent quantum Hall effects in (Hg,Mn)Te quantum wells.
View Article and Find Full Text PDFThe topic of two-dimensional topological insulators has blossomed after the first observation of the quantum spin Hall (QSH) effect in HgTe quantum wells. However, studies have been hindered by the relative fragility of the edge states. Their stability has been a subject of both theoretical and experimental investigation in the past decade.
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