Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1-xMnx)2Se3

Nature Communications
J Sánchez-BarrigaO Rader

Abstract

Magnetic doping is expected to open a band gap at the Dirac point of topological insulators by breaking time-reversal symmetry and to enable novel topological phases. Epitaxial (Bi1-xMnx)2Se3 is a prototypical magnetic topological insulator with a pronounced surface band gap of ∼100 meV. We show that this gap is neither due to ferromagnetic order in the bulk or at the surface nor to the local magnetic moment of the Mn, making the system unsuitable for realizing the novel phases. We further show that Mn doping does not affect the inverted bulk band gap and the system remains topologically nontrivial. We suggest that strong resonant scattering processes cause the gap at the Dirac point and support this by the observation of in-gap states using resonant photoemission. Our findings establish a mechanism for gap opening in topological surface states which challenges the currently known conditions for topological protection.

References

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Citations

Mar 31, 2018·Nature Communications·Nan LiuYongqing Li
Oct 27, 2017·Nature Materials·Nitin Samarth
Nov 9, 2017·Physical Chemistry Chemical Physics : PCCP·Jaime Sánchez-BarrigaLada V Yashina
Feb 8, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·L Plucinski
Jul 6, 2017·Scientific Reports·H LohaniB R Sekhar
Sep 12, 2017·Reviews of Modern Physics·Frances HellmanBarry L Zink
Dec 19, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·T YilmazB Sinkovic
Mar 15, 2018·Physical Chemistry Chemical Physics : PCCP·Turgut YilmazBoris Sinkovic
Nov 9, 2016·Physical Review Letters·S ThirupathaiahJ Fink
Sep 22, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Andrzej PtokAnna Ciechan
Oct 23, 2020·Nanomaterials·Jakub ŠebestaJan Honolka

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Methods Mentioned

BETA
X-ray
circular dichroism
scanning tunnelling microscopy
electron diffraction

Software Mentioned

ARPES
Munich
SPR
DFT
- KKR

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