Rare-earth-doped Bi2X3 (X = Se, Te) as candidates for magnetic topological insulators

Electronic structures of rare-earth (R)-doped ( ; ) single crystals, which are promising candidates for magnetic topological insulators, have been investigated by employing soft X-ray absorption spectroscopy (XAS), soft X-ray magnetic circular dichroism (XMCD), and circular dichroism (CD) angle-reso...

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Bibliographic Details
Published inPhilosophical magazine (Abingdon, England) Vol. 100; no. 10; pp. 1258 - 1267
Main Authors Kang, J.-S., Lee, Eunsook, Seong, Seungho, Yang, Min Young, Kim, Jinsu, Jung, Myung-Hwa, Park, Byeong-Gyu, Kim, Younghak, Kim, Geunyong, Kim, Jeehoon
Format Journal Article
LanguageEnglish
Published Taylor & Francis 18.05.2020
Subjects
ARPES
circular dichroism
electronic structure
Magnetic topological insulator
XAS
XMCD
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Summary:Electronic structures of rare-earth (R)-doped ( ; ) single crystals, which are promising candidates for magnetic topological insulators, have been investigated by employing soft X-ray absorption spectroscopy (XAS), soft X-ray magnetic circular dichroism (XMCD), and circular dichroism (CD) angle-resolved photoemission spectroscopy (ARPES). R XAS and XMCD measurements provide evidence that R ions are trivalent and magnetic, confirming that doped R ions have purely magnetic effects. ARPES measurements of show a finite energy gap for x>0, arising from the broken time-reversal symmetry due to magnetic R impurities. CD-ARPES measurements of reveal finite CD effects in the topological surface states. This work demonstrates that ( ) are magnetic topological insulators.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2019.1708986