Absence of superconductivity in ultrathin layers of FeSe synthesized on a topological insulator

作者：Eich, Andreas; Rollfing, Nils; Arnold, Fabian; Sanders, Charlotte; Ewen, Pascal R.; Bianchi, Marco; Dendzik, Maciej; Michiardi, Matteo; Mi, Jian-Li; Bremholm, Martin; Wegner, Daniel; Hofmann, Philip; Khajetoorians, Alexander A.^*

来源：Physical Review B, 2016, 94(12): 125437.

DOI：10.1103/PhysRevB.94.125437

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The structural and electronic properties of FeSe ultrathin layers on Bi2Se3 have been investigated with a combination of scanning tunneling microscopy and spectroscopy and angle-resolved photoemission spectroscopy. The FeSe multilayers, which are predominantly 3-5 monolayers (MLs) thick, exhibit a hole pocket-like electron band at (Gamma) over bar and a dumbbell-like feature at (M) over bar, similar to multilayers of FeSe on SrTiO3. Moreover, the topological state of the Bi2Se3 is preserved beneath the FeSe layer, as indicated by a heavily n-doped Dirac cone. Low temperature scanning tunneling spectroscopy does not exhibit a superconducting gap for any investigated thickness down to a temperature of 5 K.

• 出版日期2016-9-26
• 单位江苏大学