Observation of two-dimensional bulk electronic states in the superconducting topological insulator heterostructure Cux(PbSe) 5(Bi 2 Se 3) 6: Implications for unconventional superconductivity

K. Nakayama, H. Kimizuka, Y. Tanaka, T. Sato, S. Souma, T. Takahashi, Satoshi Sasaki, Kouji Segawa, Yoichi Ando

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) on Cux(PbSe)5(Bi2Se3)6 [(CPSBS); x=1.47], a superconductor derived from a topological insulator heterostructure, to elucidate the electronic states relevant to the occurrence of possible unconventional superconductivity. Upon Cu intercalation into the parent compound (PbSe)5(Bi2Se3)6, we observed a distinct energy shift of the bulk conduction band due to electron doping. Photon-energy-dependent ARPES measurements of CPSBS revealed that the observed bulk band forms a cylindrical electronlike Fermi surface at the Brillouin-zone center. The two-dimensional nature of the bulk electronic states puts strong constraints on the possible topological character of the superconducting state in CPSBS.

Original languageEnglish
Article number100508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number10
DOIs
Publication statusPublished - 2015 Sep 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Observation of two-dimensional bulk electronic states in the superconducting topological insulator heterostructure Cux(PbSe) 5(Bi 2 Se 3) 6: Implications for unconventional superconductivity'. Together they form a unique fingerprint.

Cite this