Common Origin of the Circular-dichroism Pattern in ARPES of SrTiO3 and CuxBi2Se3

Abstract

Circular dichroism in the angular distribution (CDAD) of photoelectrons from SrTiO3:Nb and CuxBi2Se3 is investigated by 7-eV laser ARPES. In addition to the well-known node that occurs in CDAD when the incidence plane matches the mirror plane of the crystal, we show that another type of node occurs when the mirror plane of the crystal is vertical to the incidence plane and the electronic state is two dimensional. The flower-shaped CDAD's occurring around the Fermi level of SrTiO3:Nb and around the Dirac point of CuxBi2Se3 are explained on equal footings. We point out that the penetration depth of the topological states of CuxBi2Se3 depends on momentum.

References in corpus (9)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
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• Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
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• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
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• Circular dichroism in angle-resolved photoemission spectra of under- and overdoped Pb-Bi2212
• Disentangling surface and bulk photoemission using circularly polarized light

Cited by in corpus (15)

• Emergent quantum confinement at topological insulator surfaces
• Observation of a warped helical spin-texture in Bi${}_2$Se${}_3$ from circular dichroism angle-resolved photoemission spectroscopy
• In-Plane Orbital Texture Switch at the Dirac Point in the Topological Insulator Bi2Se3
• Reversal of the circular dichroism in the angle-resolved photoemission from Bi2Te3
• Spin Polarization of Photoelectrons from Topological Insulators
• Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators
• Oscillatory surface dichroism of an insulating topological insulator Bi2Te2Se
• Coherent control over three-dimensional spin polarization for the spin-orbit coupled surface state of Bi${}_2$Se${}_3$
• Anomalous suppression of the superfluid density in the CuxBi2Se3 superconductor upon progressive Cu intercalation
• The momentum and photon energy dependence of the circular dichroic photoemission in the bulk Rashba semiconductors BiTeX (X = I, Br, Cl)
• Photoemission Circular Dichroism and Spin Polarization of the Topological Surface States in Ultrathin Bi2Te3 Films
• Layer and orbital interference effects in photoemission from transition metal dichalcogenides
• Ultrafast Evolution of Bulk, Surface and Surface Resonance States in Photoexcited Bi${}_2$Te${}_3$
• $d_{xz/yz}$ Orbital Subband Structures and Chiral Orbital Angular Momentum in the (001) Surface States of SrTiO${}_3$
• Synchrotron-radiation studies of topological insulators