Band structure of topological insulators from noise measurements in tunnel junctions
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Institute of Physics Publising LLCDate
2015-12-21Citation
10.1063/1.4938243
Applied Physics Letters 107.25 (2015): e4938243
ISSN
0003-6951 (print); 1077-3118 (online)DOI
10.1063/1.4938243Funded by
F.A. and I.M. acknowledge support by the Spanish MINECO (MAT2012-32743) and the Comunidad de Madrid through NANOFRONTMAG-CM (S2013/MIT-2850). J.P.C. acknowledges support from the Fundación Seneca (Region de Murcia) posdoctoral fellowship (19791/PD/15) and J.S.M., C.Z.C., and F.K. from Grants NSF (DMR-1207469), ONR (N00014-13-1-0301), and the STC Center for Integrated Quantum Materials under NSF Grant DMR-1231319Project
Gobierno de España. MAT2012-32743; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAGEditor's Version
http://dx.doi.org/10.1063/1.4938243Subjects
Acoustic noise measurement; Band structure; Electric insulators; Quantum theory; Scanning tunneling microscopy; Spin polarization; FísicaRights
© 2015 AIP Publishing LLCAbstract
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
Files in this item
Google Scholar:Cascales, Juan Pedro
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Martínez, Isidoro
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Katmis, Ferhat
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Chang, Cui Zu
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Guerrero, Rubén
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Moodera, Jagadeesh S.
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Aliev Kazanski, Farkhad
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