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Layer-by-layer entangled spin-orbital texture of the topological surface state in Bi2Se3.

Abstract

We study Bi(2)Se(3) by polarization-dependent angle-resolved photoemission spectroscopy and density-functional theory slab calculations. We find that the surface state Dirac fermions are characterized by a layer-dependent entangled spin-orbital texture, which becomes apparent through quantum interference effects. This explains the discrepancy between the spin polarization obtained in spin and angle-resolved photoemission spectroscopy-ranging from 20% to 85%-and the 100% value assumed in phenomenological models. It also suggests a way to probe the intrinsic spin texture of topological insulators, and to continuously manipulate the spin polarization of photoelectrons and photocurrents all the way from 0 to ±100% by an appropriate choice of photon energy, linear polarization, and angle of incidence.

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  • Authors+Show Affiliations

    ,

    Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.

    , , , , , , , ,

    Source

    Physical review letters 110:21 2013 May 24 pg 216401

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    23745898

    Citation

    TY - JOUR T1 - Layer-by-layer entangled spin-orbital texture of the topological surface state in Bi2Se3. AU - Zhu,Z-H, AU - Veenstra,C N, AU - Levy,G, AU - Ubaldini,A, AU - Syers,P, AU - Butch,N P, AU - Paglione,J, AU - Haverkort,M W, AU - Elfimov,I S, AU - Damascelli,A, Y1 - 2013/05/21/ PY - 2013/01/29/received PY - 2013/6/11/entrez PY - 2013/6/12/pubmed PY - 2013/6/12/medline SP - 216401 EP - 216401 JF - Physical review letters JO - Phys. Rev. Lett. VL - 110 IS - 21 N2 - We study Bi(2)Se(3) by polarization-dependent angle-resolved photoemission spectroscopy and density-functional theory slab calculations. We find that the surface state Dirac fermions are characterized by a layer-dependent entangled spin-orbital texture, which becomes apparent through quantum interference effects. This explains the discrepancy between the spin polarization obtained in spin and angle-resolved photoemission spectroscopy-ranging from 20% to 85%-and the 100% value assumed in phenomenological models. It also suggests a way to probe the intrinsic spin texture of topological insulators, and to continuously manipulate the spin polarization of photoelectrons and photocurrents all the way from 0 to ±100% by an appropriate choice of photon energy, linear polarization, and angle of incidence. SN - 1079-7114 UR - https://www.unboundmedicine.com/medline/citation/23745898/Layer_by_layer_entangled_spin_orbital_texture_of_the_topological_surface_state_in_Bi2Se3_ L2 - http://link.aps.org/abstract/PRL/v110/p216401 ER -