Warping effects in the band and angular-momentum structures of the topological insulator Bi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Te<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>

Jung, Wooyong; Kim, Yeongkwan; Kim, Beomyoung; Koh, Youngwoo; Kim, Chul; Matsunami, Masaharu; Kimura, S.; Arita, Masashi; Shimada, Kenya; Han, Jung Hoon; Kim, Ju‐Young; Cho, Beongki; Kim, Changyoung

doi:10.1103/physrevb.84.245435

Cited by 47 publications

(37 citation statements)

References 26 publications

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“…3a-c). Such circular dichroism has previously been suggested to probe the spin of the isolated TSS, although the microscopic origin of the dichroism has proved controversial [30][31][32][33][34] . Recently, Park et al 31 proposed the existence of an unquenched local orbital angular momentum (OAM) of the TSS.…”

Section: Resultsmentioning

confidence: 99%

Emergent quantum confinement at topological insulator surfaces

et al. 2012

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Bismuth-chalchogenides are model examples of three-dimensional topological insulators. Their ideal bulk-truncated surface hosts a single spin-helical surface state, which is the simplest possible surface electronic structure allowed by their non-trivial Z 2 topology. However, real surfaces of such compounds, even if kept in ultra-high vacuum, rapidly develop a much more complex electronic structure whose origin and properties have proved controversial. Here we demonstrate that a conceptually simple model, implementing a semiconductor-like band bending in a parameter-free tight-binding supercell calculation, can quantitatively explain the entire measured hierarchy of electronic states. In combination with circular dichroism in angle-resolved photoemission experiments, we further uncover a rich three-dimensional spin texture of this surface electronic system, resulting from the non-trivial topology of the bulk band structure. Moreover, our study sheds new light on the surface-bulk connectivity in topological insulators, and reveals how this is modified by quantum confinement.

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Section: Resultsmentioning

confidence: 99%

Emergent quantum confinement at topological insulator surfaces

et al. 2012

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“…It has been shown that OAM in the initial states should result in CD intensity which is approximately proportional to the inner product of the OAM vector and wave vector of the photon [21,29,30]. This has been shown by numerical simulation of CD-ARPES based on the band calculation [21,22].…”

Section: Complex Orbitals and Cd-arpesmentioning

confidence: 96%

Microscopic mechanism for the Rashba spin-band splitting: Perspective from formation of local orbital angular momentum

Park

Kim

2015

Journal of Electron Spectroscopy and Related Phenomena

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“…Part of these proposals involves the interpretation of the circular dichroism in the angular distribution (CDAD) of ARPES as the spin polarization of TSSs [11][12][13], which, if correct, can significantly improve the efficiency of spin detection. The CDAD effect has also been predicted as an indirect measure of the intrinsic momentum-space orbital-angularmomentum texture of the TSSs [15,16]. These interpretations are, however, unrealistic for several reasons, and one is the dominance of final-state effects in CDAD from TIs that changes sign several times with photon energy [17].…”

Section: Introductionmentioning

confidence: 99%

Photoemission ofBi2Se3with Circularly Polarized Light: Probe of Spin Polarization or Means for Spin Manipulation?

et al. 2014

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Topological insulators are characterized by Dirac-cone surface states with electron spins locked perpendicular to their linear momenta. Recent theoretical and experimental work implied that this specific spin texture should enable control of photoelectron spins by circularly polarized light. However, these reports questioned the so far accepted interpretation of spin-resolved photoelectron spectroscopy. We solve this puzzle and show that vacuum ultraviolet photons (50-70 eV) with linear or circular polarization indeed probe the initial-state spin texture of Bi 2 Se 3 while circularly polarized 6-eV low-energy photons flip the electron spins out of plane and reverse their spin polarization, with its sign determined by the light helicity. Our photoemission calculations, taking into account the interplay between the varying probing depth, dipole-selection rules, and spin-dependent scattering effects involving initial and final states, explain these findings and reveal proper conditions for light-induced spin manipulation. Our results pave the way for future applications of topological insulators in optospintronic devices.

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Warping effects in the band and angular-momentum structures of the topological insulator Bi2Te3

Cited by 47 publications

References 26 publications

Emergent quantum confinement at topological insulator surfaces

Emergent quantum confinement at topological insulator surfaces

Microscopic mechanism for the Rashba spin-band splitting: Perspective from formation of local orbital angular momentum

Photoemission ofBi2Se3with Circularly Polarized Light: Probe of Spin Polarization or Means for Spin Manipulation?

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