Details

Autor(en) / Beteiligte

• Lee, Eunsook
• Seong, Seungho
• Yang, Min Young
• Kim, Jinsu
• Jung, Myung-Hwa
• Park, Byeong-Gyu
• Kim, Younghak
• Han, Sang Wook
• Kang, J.-S.

Titel

Angle-resolved photoemission spectroscopy study of magnetic topological insulator candidates of Ce-doped Bi2–xCexSe3

Ist Teil von

• Applied physics letters, 2019-08, Vol.115 (7)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2019

Quelle

美国小型学会期刊集（AIP Scitation平台）

Beschreibungen/Notizen

• The electronic structures of the magnetic topological insulator candidates of Ce-substituted Bi2–xCexSe3 (x ≤ 0.12) have been investigated through angle-resolved photoemission spectroscopy (ARPES), soft X-ray absorption spectroscopy (XAS), and soft X-ray magnetic circular dichroism (XMCD) measurements on high-quality single crystals. Ce 3d XAS and XMCD measurements provide evidence that the substituted Ce ions in Bi2–xCexSe3 are trivalent and magnetic, confirming the purely magnetic effect of the Ce-substitution. ARPES measurements reveal the formation of an energy gap (Δ) for x > 0, indicating that the finite Δ arises from the broken time-reversal symmetry due to the substituted magnetic Ce impurities.