Observation of a smoothly tunable Dirac point in Ge(BixSb1-x)2Te4

Sean Howard, Arjun Raghavan, Davide Iaia, Caizhi Xu, David Flötotto, Man Hong Wong, Sung Kwan Mo, Bahadur Singh, Raman Sankar, Hsin Lin, Tai Chang Chiang, Vidya Madhavan

Research output: Contribution to journalArticlepeer-review


State-of-the-art topological devices require the use of topologically protected surface states to drive electronic transport. In this paper, we examine a tunable topological system, Ge(BixSb1-x)2Te4, for a range of x values from 0 to 1, using a combination of Fourier transform scanning tunneling spectroscopy and angle-resolved photoemission spectroscopy. Our results show that the Dirac point shifts linearly with x, crossing the Fermi energy near x=0.7. This observation of a smoothly tunable, isolated Dirac point crossing through the topological transport regime and having strong linear dependence with substitution can be critical for future topological spintronics applications.

Original languageEnglish (US)
Article number044201
JournalPhysical Review Materials
Issue number4
StatePublished - Apr 2022

ASJC Scopus subject areas

  • General Materials Science
  • Physics and Astronomy (miscellaneous)


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