Physics – Condensed Matter – Materials Science
Scientific paper
2011-08-22
Phys. Rev. Lett. 107, 077601 (2011)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevLett.107.077601
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.
Bell Christopher
Chen Chien-Tsu
Hwang Harold Y.
Ishida Yasuchika
Ito Yukari
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