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• W1701474716 abstract "We investigate a magnetic proximity effect on the Dirac surface states of a topological insulator (TI) induced by a ${mathrm{Bi}}_{2}{mathrm{Se}}_{3}/mathrm{EuS}$ interface, using density-functional theory (DFT) and a low-energy effective model, motivated by a recent experimental realization of the interface. We consider a thin ferromagnetic insulator EuS film stacked on top of ${mathrm{Bi}}_{2}{mathrm{Se}}_{3}$(111) slabs of three or five quintuple layers (QLs) with the magnetization of EuS normal to the interface ($z$ axis), which breaks time-reversal symmetry. It is found that a charge transfer and surface relaxation makes the Dirac cones electron doped. For both three and five QLs, the top-surface Dirac cone has an energy gap of 9 meV, while the bottom-surface Dirac cone remains gapless. This feature is due to the short-ranged induced magnetic moment of the EuS film. For the five QLs, an additional Dirac cone with an energy gap of 2 meV is formed right below the bottom-surface Dirac point, while for three QLs, there is no additional Dirac cone. We also examine the spin-orbital texture of the Dirac surface states with broken time-reversal symmetry, using DFT and the effective model. We find that the ${p}_{z}$ orbital is coupled to the $z$ component of the spin moment in the opposite sign to the ${p}_{x}$ and ${p}_{y}$ orbitals. The ${p}_{z}$ and radial $p$ orbitals are coupled to the in-plane spin texture in the opposite handedness to the tangential $p$ orbital. The result obtained from the effective model agrees with our DFT calculations. The calculated spin-orbital texture may be tested from spin-polarized angle-resolved photoemission spectroscopy." @default.
• W1701474716 created "2016-06-24" @default.
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• W1701474716 date "2014-10-03" @default.
• W1701474716 modified "2023-10-12" @default.
• W1701474716 title "Magnetic proximity effect and spin-orbital texture at the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow><mml:mo>/</mml:mo><mml:mi mathvariant=normal>EuS</mml:mi></mml:math>interface" @default.
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• W1701474716 doi "https://doi.org/10.1103/physrevb.90.155103" @default.
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