Spin-polarized quantum well states on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Bi</mml:mtext><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>Fe</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mtext>Se</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Yee, Michael M.; Zhu, Zheng; Soumyanarayanan, Anjan; He, Yang; Song, Can-Li; Pomjakushina, E.; Salman, Z.; Kanigel, Amit; Segawa, Kouji; Ando, Yoichi; Hoffman, Jennifer

doi:10.1103/physrevb.91.161306

Cited by 15 publications

(16 citation statements)

References 48 publications

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“…Ruan et al attributed the resonance to the effect of collective magnetic fluctuations, similar to the spin-exciton mechanism advocated here. The -9 meV energy of the feature that we observe is also consistent with the -8 meV feature seen in the STM measurements of Yee et al [45]. The peak observed by Yee et al is damped with increasing temperature much faster than expected from thermal broadening.…”

Section: Discussionsupporting

confidence: 80%

Effects of spin excitons on the surface states of SmB6 : A photoemission study

et al. 2016

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We present the results of high-resolution valence-band photoemission spectroscopic study of SmB6 which shows evidence for a V-shaped density of states of surface origin within the bulk gap. The spectroscopy data is interpreted in terms of the existence of heavy 4f surface states, which may be useful in resolving the controversy concerning the disparate surface Fermi-surface velocities observed in experiments. Most importantly, we 1 find that the temperature dependence of the valence-band spectrum indicates that a small feature appears at a binding energy of about -9 meV at low temperatures. We attribute this feature to a resonance caused by the spin-exciton scattering in SmB6 which destroys the protection of surface states due to time-reversal invariance and spin-momentum locking. The existence of a low-energy spin-exciton may be responsible for the scattering which suppresses the formation of coherent surface quasi-particles and the appearance of the saturation of the resistivity to temperatures much lower than the coherence temperature associated with the opening of the bulk gap.

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Section: Discussionsupporting

confidence: 80%

Effects of spin excitons on the surface states of SmB6 : A photoemission study

et al. 2016

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“…42 According to the available experimental data, [43][44][45][46][47][48][49][50][51][52][53][54][55][56] 3d transition metal impurities in tetradymite-like chalcogenides substitute typically cation atoms (Bi and Sb). However, STM studies also reveal van der Waals positions 50,54 of Fe atoms in the bulk Bi 2 Se 3 . Based on these data, we considered that V may occupy the substitutional position in the (Bi,Sb)-sublattice and the octahedral interstitial site in the vdW gap.…”

Section: Theorymentioning

confidence: 99%

“…The experimental lattice constants and atomic coordinates of (Bi,Sb) 2 Te 3 were adopted for the calculations. 42 According to the available experimental data, [43][44][45][46][47][48][49][50][51][52][53][54][55][56] 3d transition metal impurities in tetradymite-like chalcogenides substitute typically cation atoms (Bi and Sb). However, STM studies also reveal van der Waals positions 50,54 of Fe atoms in the bulk Bi 2 Se 3 .…”

Section: Theorymentioning

confidence: 99%

Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators

et al. 2017

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We combine low energy muon spin rotation (LE-µSR) and soft-X-ray angle-resolved photoemission spectroscopy (SX-ARPES) to study the magnetic and electronic properties of magnetically doped topological insulators, (Bi,Sb)2Te3. We find that one achieves a full magnetic volume fraction in samples of (V/Cr)x(Bi,Sb)2−xTe3 at doping levels x 0.16. The observed magnetic transition is not sharp in temperature indicating a gradual magnetic ordering. We find that the evolution of magnetic ordering is consistent with formation of ferromagnetic islands which increase in number and/or volume with decreasing temperature. Resonant ARPES at the V L3 edge reveals a nondispersing impurity band close to the Fermi level as well as V weight integrated into the host band structure. Calculations within the coherent potential approximation of the V contribution to the spectral function confirm that this impurity band is caused by V in substitutional sites. The implications of our results on the observation of the quantum anomalous Hall effect at mK temperatures are discussed.

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“…were followed by experimental confirmations from transport [16][17][18] , ARPES [19][20][21][22][23][24] , and scanning tunneling microscopy/spectroscopy (STM/STS) 25 . In this way, the existence of an odd number of in-gap surface states has been established in SmB 6 .…”

Section: Introductionmentioning

confidence: 99%

Two distinct topological phases in the mixed-valence compoundYbB6and its differences fromSmB6

et al. 2015

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We discuss the evolution of topological states and their orbital textures in the mixed valence compounds SmB6 and YbB6 within the framework of the generalized gradient approximation plus onsite Coulomb interaction (GGA+U) scheme for a wide range of values of U . In SmB6, the topological Kondo insulator (TKI) gap is found to be insensitive to the value of U , but in sharp contrast, Kondo physics in isostructural YbB6 displays a surprising sensitivity to U . In particular, as U is increased in YbB6, the correlated TKI state in the weak-coupling regime transforms into a d − p-type topological insulator phase with a band inversion between Yb-5d and B-2p orbitals in the intermediate coupling range, without closing the insulating energy gap throughout this process. Our theoretical predictions related to the TKI and non-TKI phases in SmB6 and YbB6 are in substantial accord with recent angle-resolved photoemission spectroscopy (ARPES) experiments.

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Spin-polarized quantum well states onBi2−xFexSe3

Cited by 15 publications

References 48 publications

Effects of spin excitons on the surface states of SmB6 : A photoemission study

Effects of spin excitons on the surface states of SmB6 : A photoemission study

Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators

Two distinct topological phases in the mixed-valence compoundYbB6and its differences fromSmB6

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