Surface-sensitive two-dimensional magneto-fingerprint in mesoscopic Bi 2Se3 channels

Abhinav Kandala, Anthony Raymond Richardella, Duming Zhang, Thomas C. Flanagan, Nitin Samarth

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Periodic Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations have traditionally been observed in lateral transport through patterned mesoscopic loops of diffusive conductors. However, our studies of perpendicular-to-plane magnetotransport in straight-channel, diffusive devices of epitaxial Bi 2Se3 surprisingly reveal signatures of Aharonov-Bohm orbits, periodic conductance fluctuation magneto-fingerprints, even though the devices are not explicitly patterned into loops. We show that the length scale of these orbits corresponds to the typical perimeter of triangular terraces found on the surface of these thin film devices, strongly suggesting that the periodic magneto-fingerprint arises from coherent scattering of electron waves from the step-edges. Our interpretation is bolstered by control measurements in devices without such surface morphology that only show a conventional, aperiodic magneto-fingerprint. These results show that lithographically patterned Bi 2Se3 devices provide a novel class of mesoscopic physical systems for systematic studies of coherent surface sensitive transport.

Original languageEnglish (US)
Pages (from-to)2471-2476
Number of pages6
JournalNano letters
Volume13
Issue number6
DOIs
StatePublished - Jun 12 2013

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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