Topological characters in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mi>Te</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:math>thin films

Wu, Xianxin; Qin, Shengshan; Liang, Yi; Fan, Heng; Hu, Jiangping

doi:10.1103/physrevb.93.115129

Cited by 156 publications

(137 citation statements)

References 38 publications

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“…Band calculations1820 and previous ARPES studies on similar materials21 demonstrate that the Se 4 p z orbital is hybridized with the Fe 3 d xy orbital at Γ. It is known that the position of this band is quite sensitive to the Se height (on the very top of the film)1820. In fact, our calculations (Supplementary Fig.…”

Section: Resultssupporting

confidence: 68%

“…We note that K 4 s states have an even much smaller cross section in this energy range and could be hardly observed, thus excluding the possibility of a K impurity band. Band calculations1820 and previous ARPES studies on similar materials21 demonstrate that the Se 4 p z orbital is hybridized with the Fe 3 d xy orbital at Γ. It is known that the position of this band is quite sensitive to the Se height (on the very top of the film)1820.…”

Section: Resultsmentioning

confidence: 77%

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Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer

Shi

Han

et al. 2017

Nat Commun

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The origin of enhanced superconductivity over 50 K in the recently discovered FeSe monolayer films grown on SrTiO3 (STO), as compared to 8 K in bulk FeSe, is intensely debated. As with the ferrochalcogenides AxFe2−ySe2 and potassium-doped FeSe, which also have a relatively high-superconducting critical temperature (Tc), the Fermi surface (FS) of the FeSe/STO monolayer films is free of hole-like FS, suggesting that a Lifshitz transition by which these hole FSs vanish may help increasing Tc. However, the fundamental reasons explaining this increase of Tc remain unclear. Here we report a 15 K jump of Tc accompanying a second Lifshitz transition characterized by the emergence of an electron pocket at the Brillouin zone centre, which is triggered by high-electron doping following in situ deposition of potassium on FeSe/STO monolayer films. Our results suggest that the pairing interactions are orbital dependent in generating enhanced superconductivity in FeSe.

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 77%

Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer

Shi

Han

et al. 2017

Nat Commun

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“…Below T c , strong evidence for Majorana vortex bound states has been found reproducibly in several scanning tunneling microscopy (STM) experiments [13,[16][17][18], following from the theoretical prediction of surface topological superconductivity developed via a "self-proximity" effect [19]. Similar to its bulk counterpart, the normal-state band structure of monolayer FTS has been theoretically predicted to be topological [10]. This prediction is further supported by a recent systematic ARPES measurement of monolayer FTS [20,21], clearly revealing a bulk topological phase transition (band gap closing at Γ) by continuously changing the value of x.…”

mentioning

confidence: 91%

Higher-Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures

et al. 2019

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We show theoretically that a heterostructure of monolayer FeTe1−xSex -a superconducting quantum spin Hall material -with a monolayer of FeTe -a bicollinear antiferromagnet -realizes a higher order topological superconductor phase characterized by emergent Majorana zero modes pinned to the sample corners. We provide a minimal effective model for this system, analyze the origin of higher order topology, and fully characterize the topological phase diagram. Despite the conventional s-wave pairing, we find rather surprising emergence of a novel topological nodal superconductor in the phase diagram. Featured by edge-dependent Majorana flat bands, the topological nodal phase is protected by an antiferromagnetic chiral symmetry. We also discuss the experimental feasibility, the estimation of realistic model parameters, and the robustness of the Majorana corner modes against magnetic disorder. Our work provides a new experimentally feasible high-temperature platform for both higher order topology and non-Abelian Majorana physics. arXiv:1905.10647v2 [cond-mat.supr-con]

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“…The first success was achieved by proximity coupling semiconductor quantum wires with strong Rashba spin-orbit coupling to an s-wave superconductor under a Zeeman field [11][12][13][14][15][16][17]. Topological superconductivity can also be achieved by proximity coupling s-wave superconductors to topological insulator surface states [18][19][20][21][22][23][24], placing magnetic ion chains/islands on top of an s-wave superconductor [25][26][27], and occurs in some Febased superconductors [28][29][30][31]. For TSC systems based on proximity-coupling to parent s-wave superconductors, the general scheme is to obtain the topological property from an exploitable feature of the electronic structure of the host system, for example from the large spin-splitting in the Dirac-like surface state of 2D band topological insulators [18].…”

Section: Introductionmentioning

confidence: 99%

Vortex-lattice structure and topological superconductivity in the quantum Hall regime

Chaudhary

MacDonald

2020

Phys. Rev. B

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Chiral topological superconductors are expected to appear as intermediate states when a quantum anomalous Hall system is proximity coupled to an s-wave superconductor and the magnetization direction is reversed. In this paper we address the edge state properties of ordinary quantum Hall systems proximity coupled to s-wave superconductors, accounting explicitly for Landau quantization. We find that the appearance of topological superconducting phases with an odd number of Majorana edge modes is dependent on the structure of the system's vortex lattice. More precisely, vortex lattices containing odd number of superconducting flux quanta per unit cell, always support an even number of chiral edge channels and are therefore adiabatically connected to normal quantum Hall insulators. We discuss strategies to engineer chiral topological superconductivity in proximity-coupled quantum Hall systems by manipulating vortex lattice structure. arXiv:1903.12249v3 [cond-mat.mes-hall] 9 Jan 2020

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Topological characters inFe(Te1−xSex)thin films

Cited by 156 publications

References 38 publications

Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer

Enhanced superconductivity accompanying a Lifshitz transition in electron-doped FeSe monolayer

Higher-Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures

Vortex-lattice structure and topological superconductivity in the quantum Hall regime

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