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  Super-Resonant Transport of Topological Surface States Subjected to In-Plane Magnetic Fields

Zhang, S.-B., Li, C.-A., Pena-Benitez, F., Surowka, P., Moessner, R., Molenkamp, L. W., et al. (2021). Super-Resonant Transport of Topological Surface States Subjected to In-Plane Magnetic Fields. Physical Review Letters, 127(7): 076601, pp. 1-8. doi:10.1103/PhysRevLett.127.076601.

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Zhang, Song-Bo1, Author
Li, Chang-An1, Author
Pena-Benitez, Francisco1, Author
Surowka, Piotr1, Author
Moessner, Roderich1, Author
Molenkamp, Laurens W.2, Author              
Trauzettel, Bjoern1, Author
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1External Organizations, ou_persistent22              
2Laurens Molenkamp, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_3266847              

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 Abstract: Magnetic oscillations of Dirac surface states of topological insulators are typically expected to be associated with the formation of Landau levels or the Aharonov-Bohm effect. We instead study the conductance of Dirac surface states subjected to an in-plane magnetic field in the presence of a barrier potential. Strikingly, we find that, in the case of large barrier potentials, the surface states exhibit pronounced oscillations in the conductance when varying the magnetic field, in the absence of Landau levels or the Aharonov-Bohm effect. These novel magnetic oscillations are attributed to the emergence of super-resonant transport by tuning the magnetic field, in which many propagating modes cross the barrier with perfect transmission. In the case of small and moderate barrier potentials, we identify a positive magnetoconductance due to the increase of the Fermi surface by tilting the surface Dirac cone. Moreover, we show that for weak magnetic fields, the conductance displays a shifted sinusoidal dependence on the field direction with period p and phase shift determined by the tilting direction with respect to the field direction. Our predictions can be applied to various topological insulators, such as HgTe and Bi2Se3, and provide important insights into exploring and understanding exotic magnetotransport properties of topological surface states.

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Language(s): eng - English
 Dates: 2021-08-102021-08-10
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 127 (7) Sequence Number: 076601 Start / End Page: 1 - 8 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1