Nanomosaic of Topological Dirac States on the Surface of Pb5Bi24Se41 Observed by Nano-ARPES

Kosuke Nakayama, Seigo Souma, Chi Xuan Trang, Daichi Takane, Chaoyu Chen, Jose Avila, Takashi Takahashi, Satoshi Sasaki, Kouji Segawa, Maria Carmen Asensio, Yoichi Ando, Takafumi Sato

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8 Citations (Scopus)


We have performed scanning angle-resolved photoemission spectroscopy with a nanometer-sized beam spot (nano-ARPES) on the cleaved surface of Pb5Bi24Se41, which is a member of the (PbSe)5(Bi2Se3)3m homologous series (PSBS) with m = 4 consisting of alternate stacking of the topologically trivial insulator PbSe bilayer and four quintuple layers (QLs) of the topological insulator Bi2Se3. This allows us to visualize a mosaic of topological Dirac states at a nanometer scale coming from the variable thickness of the Bi2Se3 nanoislands (1-3 QLs) that remain on top of the PbSe layer after cleaving the PSBS crystal, because the local band structure of topological origin changes drastically with the thickness of the Bi2Se3 nanoislands. A comparison of the local band structure with that in ultrathin Bi2Se3 films on Si(111) gives us further insights into the nature of the observed topological states. This result demonstrates that nano-ARPES is a very useful tool for characterizing topological heterostructures.

Original languageEnglish
Pages (from-to)3737-3742
Number of pages6
JournalNano Letters
Issue number6
Publication statusPublished - 2019 Jun 12


  • Nano-ARPES
  • band structure
  • quantum confinement
  • topological heterostructure
  • ultrathin film


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