Gate-tunable quantum Hall effects in defect-suppressed B i2 S e3 films

Nikesh Koirala, Maryam Salehi, Jisoo Moon, Seongshik Oh

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Despite many years of efforts, attempts to reach the quantum regime of topological surface states (TSS) on an electrically tunable topological insulator (TI) platform have so far failed on binary TI compounds such as Bi2Se3 due to high density of interfacial defects. Here, utilizing an optimal buffer layer on a gatable substrate, we demonstrate the first electrically tunable quantum Hall effects (QHE) on TSS of Bi2Se3. On the n side, well-defined QHE shows up, but it diminishes near the charge neutrality point (CNP) and completely disappears on the p side. Furthermore, around the CNP the system transitions from a metallic to a highly resistive state as the magnetic field is increased, whose temperature dependence indicates presence of an insulating ground state at high magnetic fields.

Original languageEnglish (US)
Article number085404
JournalPhysical Review B
Volume100
Issue number8
DOIs
StatePublished - Aug 5 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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