Band structure of topological insulators from noise measurements in tunnel junctions

Juan Pedro Cascales, Isidoro Martínez, Ferhat Katmis, Cui Zu Chang, Rubén Guerrero, Jagadeesh S. Moodera, Farkhad G. Aliev

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The unique properties of spin-polarized surface or edge states in topological insulators (TIs) make these quantum coherent systems interesting from the point of view of both fundamental physics and their implementation in low power spintronic devices. Here we present such a study in TIs, through tunneling and noise spectroscopy utilizing TI/Al2O3/Co tunnel junctions with bottom TI electrodes of either Bi2Te3 or Bi2Se3. We demonstrate that features related to the band structure of the TI materials show up in the tunneling conductance and even more clearly through low frequency noise measurements. The bias dependence of 1/f noise reveals peaks at specific energies corresponding to band structure features of the TI. TI tunnel junctions could thus simplify the study of the properties of such quantum coherent systems that can further lead to the manipulation of their spin-polarized properties for technological purposes.

Original languageEnglish (US)
Article number252402
JournalApplied Physics Letters
Volume107
Issue number25
DOIs
StatePublished - Dec 21 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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