Absence of superconductivity in ultra-thin layers of FeSe synthesized on a topological insulator

Abstract

The structural and electronic properties of FeSe ultra-thin layers on Bi${}_2$Se${}_3$ have been investigated with a combination of scanning tunneling microscopy and spectroscopy and angle-resolved photoemission spectroscopy. The FeSe multi-layers, which are predominantly 3-5 monolayers (ML) thick, exhibit a hole pocket-like electron band at \barΓ and a dumbbell-like feature at \bar{M}, similar to multi-layers of FeSe on SrTiO${}_3$. Moreover, the topological state of the Bi2Se3 is preserved beneath the FeSe layer, as indicated by a heavily \it{n}-doped Dirac cone. Low temperature STS does not exhibit a superconducting gap for any investigated thickness down to a temperature of 5 K.

References in corpus (9)

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Cited by in corpus (11)

• Room temperature magnetization switching in topological insulator-ferromagnet heterostructures by spin-orbit torques
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Evidence for interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Intrinsic interfacial van der Waals monolayers and their effect on the high-temperature superconductor FeSe/SrTiO${}_3$
• Step-edge assisted large scale FeSe monolayer growth on epitaxial Bi2Se3 thin films
• Structural and electronic properties of ultrathin FeSe films grown on Bi${}_2$Se${}_3$(0001) studied by STM/STS
• Electronic Structure of Fe${}_{1.08}$Te bulk crystals and epitaxial FeTe thin films on Bi${}_2$Te${}_3$
• Evidence for a two-fold symmetric superconducting gap in a monolayer of FeSe${}_{0.5}$Te${}_{0.5}$ on a topological insulator
• Fragility of the Dirac Cone Splitting in Topological Crystalline Insulator Heterostructures
• Moire Superlattice Modulations in Single-Unit-Cell FeTe Films Grown on NbSe2 Single Crystals