Topographic images of a seven-quintuple-layer Sb₂Te₃ film (top) featuring an n-p circular junction (magnified in the lower insets).

From the article:

Berry-Phase Switch in Electrostatically Confined Topological Surface States
Jun Zhang, Ye-Ping Jiang, Xu-Cun Ma, and Qi-Kun Xue
Phys. Rev. Lett. 128, 126402 (2022)

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