Common Origin of the Circular-Dichroism Pattern in Angle-Resolved Photoemission Spectroscopy ofSrTiO3andCuxBi2Se3
| Autor: | Shuntaro Watanabe, Yusuke Kozuka, A. Kikkawa, Harold Y. Hwang, Yukiaki Ishida, Shik Shin, Christopher Bell, H. Kanto, Yasutomo Ota, M. Mulazzi, M. Okawa, Minu Kim, Y. Tokura, Kozo Okazaki, Walid Malaeb, Y. Ito, Yasujiro Taguchi, C. T. Chen |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Physical Review Letters. 107 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.107.077601 |
| Popis: | Circular dichroism in the angular distribution of photoelectrons from ${\mathrm{SrTiO}}_{3}\mathrm{\text{:}}\mathrm{Nb}$ and ${\mathrm{Cu}}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ is investigated by 7-eV laser angle-resolved photoemission spectroscopy. In addition to the well-known node that occurs in the circular dichroism pattern 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 circular dichroism patterns in the angular distribution occurring around the Fermi level of ${\mathrm{SrTiO}}_{3}\mathrm{\text{:}}\mathrm{Nb}$ and around the Dirac point of ${\mathrm{Cu}}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ are explained on equal footings. We point out that the penetration depth of the topological states of ${\mathrm{Cu}}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ depends on momentum. |
| Databáze: | OpenAIRE |
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