FeTe1−Se  monolayer films: towards the realization of high-temperature connate topological superconductivity

Shi, Xun; Han, Zhiqing; Richard, P.; Wu, Xianxin; Peng, X.-L.; Qian, Tian; Wang, S.-C.; Hu, Jiangping; Sun, Yujuan; Ding, Hong

doi:10.1016/j.scib.2017.03.010

Cited by 79 publications

(77 citation statements)

References 31 publications

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“…In particular, the structure shown in Fig. 23 (a), is the direct realization of Ginzburg "sandwich", precisely as was proposed in his original works [1].…”

Section: Nonadiabatic Superconductivity and Other Problemsmentioning

confidence: 94%

“…The structure of FeSe films on SrTiO 3 , shown Fig. 3, represents the typical Ginzburg's "sandwich" [1], which indicates the possibility of realization of excitonic mechanism of superconductivity. Let us consider the widely known version of this mechanism, as proposed for such a system long ago by Allender, Bray and Bardeen (ABB) [74].…”

Section: Models Of T C Enhancement In Fese Monolayer Due To Interactimentioning

confidence: 95%

“…It is natural to assume that this enhancement is somehow related to the nature of STO(BTO) substrate, e.g. with additional pairing interaction of carriers in FeSe layer, appearing due to their interaction with some kind of elementary excitations in the substrate, in the spirit of "excitonic" mechanism, as was initially proposed by Ginzburg [1,2].…”

Section: Models Of T C Enhancement In Fese Monolayer Due To Interactimentioning

confidence: 99%

“…The initial Ginzburg's guess to enhance T c in "sandwich" type structures [1] was based on the idea of electron in metallic film interaction with more or less high -energy excitations of electronic nature ("excitons") within semiconducting substrate. However, this idea can be understood in a wider context -interaction of electrons of metallic film with some arbitrary Boson excitations in substrate (e.g.…”

Section: Interaction With Optical Phonons In Stomentioning

confidence: 99%

“…And this problem, which was put into the agenda mainly due to the enthusiasm of V.L. Ginzburg [1,2], still remains among the central problems of the modern physics of condensed matter.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature superconductivity in FeSe monolayers

Sadovskiǐ

2016

Phys.-Usp.

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This review discusses the main experiments and theoretical views related to observation of high -temperature superconductivity in intercalated FeSe compounds and single layer films of FeSe on substrates like SrTiO 3 . We consider in detail the electronic structure of these systems, both theoretical calculations of this structure at hand and their correspondence with ARPES experiments. It is stressed that electronic spectrum of these systems is qualitatively different from typical picture of the spectrum in well studied FeAs superconductors and the related problems of theoretical description of spectrum formation are also discussed.We also discuss the possible mechanisms of Cooper pairing in monolayers of FeSe and problems appearing here. As single layer films of FeSe on SrTiO 3 can be represented as typical Ginzburg"sandwiches", we analyze the possibility of rising the critical temperature of superconducting transition T c due to different variants of "excitonic" mechanism of superconductivity. It is shown, that in its classic variant (as proposed for such systems by Allender, Bray and Bardeen) this mechanism is unable to explain the observed values of T c , but situation is different when we consider instead of "excitons" the optical phonons in SrTiO 3 (with energy of the order of 100 meV). We consider both the simplest model of T c enhancement due to interaction with such phonons and more specific models with dominant "forward" scattering, which allow to understand the growth of T c as compared with the case of bulk FeSe and intercalated FeSe systems. We also discuss the problems connected with antiadiabatic nature of superconductivity due to such mechanism.

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“…In particular, the structure shown in Fig. 23 (a), is the direct realization of Ginzburg "sandwich", precisely as was proposed in his original works [1].…”

Section: Nonadiabatic Superconductivity and Other Problemsmentioning

confidence: 94%

Section: Models Of T C Enhancement In Fese Monolayer Due To Interactimentioning

confidence: 95%

Section: Models Of T C Enhancement In Fese Monolayer Due To Interactimentioning

confidence: 99%

Section: Interaction With Optical Phonons In Stomentioning

confidence: 99%

“…And this problem, which was put into the agenda mainly due to the enthusiasm of V.L. Ginzburg [1,2], still remains among the central problems of the modern physics of condensed matter.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-temperature superconductivity in FeSe monolayers

Sadovskiǐ

2016

Phys.-Usp.

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Recent Advances in 2D Superconductors

et al. 2021

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The emergence of superconductivity in 2D materials has attracted much attention and there has been rapid development in recent years because of their fruitful physical properties, such as high transition temperature (Tc), continuous phase transition, and enhanced parallel critical magnetic field (Bc). Tremendous efforts have been devoted to exploring different physical parameters to figure out the mechanisms behind the unexpected superconductivity phenomena, including adjusting the thickness of samples, fabricating various heterostructures, tuning the carrier density by electric field and chemical doping, and so on. Here, different types of 2D superconductivity with their unique characteristics are introduced, including the conventional Bardeen–Cooper–Schrieffer superconductivity in ultrathin films, high‐Tc superconductivity in Fe‐based and Cu‐based 2D superconductors, unconventional superconductivity in newly discovered twist‐angle bilayer graphene, superconductivity with enhanced Bc, and topological superconductivity. A perspective toward this field is then proposed based on academic knowledge from the recently reported literature. The aim is to provide researchers with a clear and comprehensive understanding about the newly developed 2D superconductivity and promote the development of this field much further.

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Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

et al. 2021

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The enhanced superconductivity in monolayer FeSe on titanates opens a fascinating pathway toward the rational design of high‐temperature superconductors. Utilizing the state‐of‐the‐art oxide plus chalcogenide molecular beam epitaxy systems in situ connected to a synchrotron angle‐resolved photoemission spectroscope, epitaxial LaTiO3 layers with varied atomic thicknesses are inserted between monolayer FeSe and SrTiO3, for systematic modulation of interfacial chemical potential. With the dramatic increase of electron accumulation at the LaTiO3/SrTiO3 surface, providing a substantial surge of work function mismatch across the FeSe/oxide interface, the charge transfer and the superconducting gap in the monolayer FeSe are found to remain markedly robust. This unexpected finding indicate the existence of an intrinsically anchored “magic” doping within the monolayer FeSe systems.

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FeTe1−Se monolayer films: towards the realization of high-temperature connate topological superconductivity

Cited by 79 publications

References 31 publications

High-temperature superconductivity in FeSe monolayers

High-temperature superconductivity in FeSe monolayers

Recent Advances in 2D Superconductors

Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates

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