Electronic structure of Bi2Te3/FeTe heterostructure: implications for unconventional superconductivity

Abstract

We have performed angle-resolved photoemission spectroscopy on a heterostructure consisting of topological insulator Bi2Te3 and iron chalcogenide FeTe fabricated on SrTiO3 substrate by molecular-beam-epitaxy technique. This system was recently found to show superconductivity albeit non-superconducting nature of each constituent material. Upon interfacing FeTe with two quintuple layers of Bi2Te3, we found that the Dirac-cone surface state of Bi2Te3 is shifted toward higher binding energy, while the holelike band at the Fermi level originating from FeTe moves toward lower binding energy. This suggests that electron charge transfer takes place from FeTe to Bi2Te3 through the interface. The present result points to importance of hole-doped FeTe interface for the occurrence of unconventional superconductivity.

arXiv comment5 pages, 4 figures

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Cited by in corpus (12)

• Interface-Induced Superconductivity in Magnetic Topological Insulator-Iron Chalcogenide Heterostructures
• Studies on the origin of the interfacial superconductivity of Sb2Te3/Fe1+yTe heterostructures
• Hybrid symmetry epitaxy of superconducting Fe(Te,Se) film on a topological insulator
• Monolayer superconductivity and tunable topological electronic structure at the Fe(Te,Se)/Bi2Te3 interface
• Dirac-Fermion-Assisted Interfacial Superconductivity in Epitaxial Topological Insulator/Iron Chalcogenide Heterostructures
• Oxygen adsorption induced superconductivity in ultrathin FeTe film on SrTiO3(001)
• High quality Fe1+yTe synthesized by chemical vapor deposition with conspicuous vortex flow
• Control of nonreciprocal charge transport in topological insulator/superconductor heterostructures with Fermi level tuning and superconducting-layer thickness
• Two-dimensional superconducting diode effect in topological insulator/superconductor heterostructure
• Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures
• Ubiquity of rotational symmetry breaking in superconducting films, from Fe(Te,Se)/Bi${}_2$Te${}_3$ to Nb, and the effect of measurement geometry
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control