Interfacial dirac cones from alternating topological invariant superlattice structures of Bi2Se3

Jung Hwan Song, Hosub Jin, Arthur J. Freeman

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When the three-dimensional topological insulators Bi2Se 3 and Bi2Te3 have an interface with vacuum, i.e., a surface, they show remarkable features such as topologically protected and spin-momentum locked surface states. However, for practical applications, one often requires multiple interfaces or channels rather than a single surface. Here, for the first time, we show that an interfacial and ideal Dirac cone is realized by alternating band and topological insulators. The multichannel Dirac fermions from the superlattice structures open a new way for applications such as thermoelectric and spintronics devices. Indeed, utilizing the interfacial Dirac fermions, we also demonstrate the possible power factor improvement for thermoelectric applications.

Original languageEnglish
Article number096403
JournalPhysical review letters
Issue number9
Publication statusPublished - Aug 27 2010


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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