Electronic structure and morphology of thin surface alloy layers formed by deposition of Sn on Au(1 1 1)

Sadhukhan, Pampa; Pandey, Dhanshree; Singh, Vipin Kumar; Sarkar, Shuvam; Rai, Abhishek; Bhattacharya, Kuntala; Chakrabarti, Aparna; Barman, Sudipta Roy

doi:10.1016/j.apsusc.2019.144606

Cited by 13 publications

(18 citation statements)

References 67 publications

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“…4 (c) and (d). We note that no signature of a Au-Sn alloy, i.e., typical Λ-shape bands around the Γ point, is present [25]. The effective mass m* is calculated to be 0.41me, where me is the electron rest mass, which is significantly higher than for that of the bare Au(111) Shockley surface state (0.28me).…”

Section: Resultsmentioning

confidence: 74%

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Epitaxial growth of honeycomb-like stanene on Au(111)

Pang

Nishino

Ogikubo

et al. 2020

Applied Surface Science

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Stanene, which is predicted to be a quantum spin Hall topological insulator with tunable topological state, seems to be the most promising candidate of the post-graphene elemental two-dimensional (2D) materials. Here, we prepared epitaxial honeycomb-like stanene on gold (111) substrates and investigated its superstructure by Low Energy Electron Diffraction and Scanning Tunneling Microscopy. Angle-Resolved PhotoEmission Spectroscopy was applied to explore the electronic structures, further confirmed by first principles calculations. The stanene-like sheet forms a nearly planar structure on the Au(111) surface with a "2×√3" superstructure in large surface areas. Core-level spectroscopy reveals that the stanene-like sheet lays almost directly on the Au(111) surface. This is consistent with DFT calculations of the atomic structure. A characteristic 2D band with parabolic dis-persion is observed.

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Section: Resultsmentioning

confidence: 74%

“…A few groups have studied the growth of tin on gold (111) surfaces by different methods [22][23][24][25][26][27]. However, the experimental realization of stanene remains challenging.…”

Section: Introductionmentioning

confidence: 99%

Epitaxial growth of honeycomb-like stanene on Au(111)

Pang

Nishino

Ogikubo

et al. 2020

Applied Surface Science

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“…Sn was deposited on Au(111) using water cooled Knudsen cell 28 operated at 1140±5 K at the chamber base pressure of 8×10 −10 mbar. Note that the deposition rate used here is 8 times larger than that used in our earlier work where small amount of Sn equivalent to about a monolayer was deposited using a cell temperature of 1080 K. 29 Low energy electron diffraction (LEED) patterns were recorded using a four-grid rear view optics from OCI Vacuum Microengineering. X-ray photoemission spectroscopy (XPS) measurements were carried out using R4000 electron energy analyzer and monochromatized AlKα laboratory x-ray source with 1486.6 eV photon energy (hν) from Scienta Omicron GmbH at the base pressure of 1×10 −10 mbar.…”

Section: Methodsmentioning

confidence: 99%

“…36 This implies intermixing of Sn and Au, since if Sn grew as layer by layer, the plasmons would have appeared when a monolayer is formed, as discussed in our earlier work on thin (< 1 nm) layers of Au-Sn. 29 Least square fitting of the core-level spectra: In order to extract quantitative information from the core-level spectra in Fig. 1, we have performed least square curve fitting.…”

Section: Methodsmentioning

confidence: 99%

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Electronic structure of Au-Sn compounds grown on Au(111)

et al. 2019

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The electronic structure of Au-Sn intermetallic layers of different compositions grown on Au (111) to the thickness of several nanometers has been studied in this work. The layer, interface and the substrate related components in the Au 4f and Sn 4d core-level spectra obtained using x-ray photoelectron spectroscopy (XPS) vary with deposition parameters to reveal the details of the Au-Sn formation. While AuSn is grown by deposition at room temperature, Au rich compounds form as a result of heat treatment through inter diffusion of Au and Sn. Deposition at high temperature arXiv:1911.10002v2 [cond-mat.mtrl-sci]

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Signatures of Topological Surface State and Unconventional Magnetotransport Properties in Elemental Ruthenium

et al. 2023

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In recent years, the pursuit of new topological materials has created a vast and ever growing catalogue of compounds. However, the example of elemental topological metals is still rather limited. So far, the non-trivial topological states have been probed in only a handful of elements and that too rarely in a transition metal. By combining the angle-resolved photoemission spectroscopy (ARPES) and magnetotransport measurements, here, ruthenium (Ru) is experimentally confirmed to be a topological metal, validating a recent theoretical prediction. The ARPES data for Ru(0001) provide evidence of the topological surface state related to the bulk Dirac node. Ru also exhibits a prominent planar Hall effect, thus further indicating its Dirac semimetallic nature. Large electron and hole mobilities are estimated, which are comparable to several topological semimetals. The non-trivial nature of electronic band of Ru is also supported by the large non-saturating transverse magnetoresistance.

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Electronic structure and morphology of thin surface alloy layers formed by deposition of Sn on Au(1 1 1)

Cited by 13 publications

References 67 publications

Epitaxial growth of honeycomb-like stanene on Au(111)

Epitaxial growth of honeycomb-like stanene on Au(111)

Electronic structure of Au-Sn compounds grown on Au(111)

Signatures of Topological Surface State and Unconventional Magnetotransport Properties in Elemental Ruthenium

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Electronic structure and morphology of thin surface alloy layers formed by deposition of Sn on Au(1 1 1)

Cited by 13 publications

References 67 publications

Epitaxial growth of honeycomb-like stanene on Au(111)

Epitaxial growth of honeycomb-like stanene on Au(111)

Electronic structure of Au-Sn compounds grown on Au(111)

Signatures of Topological Surface State and Unconventional Magnetotransport Properties in Elemental Ruthenium

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Electronic structure and morphology of thin surface alloy layers formed by deposition of Sn on Au(1 1 1)