Reversal of the circular dichroism in the angle-resolved photoemission from Bi2Te3

Abstract

The helical Dirac fermions at the surface of topological insulators show a strong circular dichroism which has been explained as being due to either the initial-state spin angular momentum, the initial-state orbital angular momentum, or the handedness of the experimental setup. All of these interpretations conflict with our data from Bi2Te3 which depend on the photon energy and show several sign changes. Our one-step photoemission calculations coupled to ab initio theory confirm the sign change and assign the dichroism to a final-state effect. The spin polarization of the photoelectrons, instead, remains a reliable probe for the spin in the initial state.

16 pages, 4 figures; submitted to Physical Review Letters

References in corpus (9)

• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
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• Direct Measurement of the Out-of-Plane Spin Texture in the Dirac Cone Surface State of a Topological Insulator
• Widespread spin polarization effects in photoemission from topological insulators
• Spin and Orbital Angular Momentum Structures of Cu(111) and Au(111) Surface States
• Observation of warping effects in the band and angular momentum structures of topological insulator Bi2Te3
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