Silicene versus two-dimensional ordered silicide: Atomic and electronic structure of Si-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:msqrt><mml:mn>19</mml:mn></mml:msqrt><mml:mo>×</mml:mo><mml:msqrt><mml:mn>19</mml:mn></mml:msqrt><mml:mo>)</mml:mo></mml:mrow><mml:mi>R</mml:mi><mml:mn>23</mml:mn><mml:mo>.</mml:mo><mml:msup><mml:mn>4</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:mrow></mml:math>/Pt(111)

Švec, Martin; Hapala, Prokop; Ondráček, Martin; Merino, Pablo; Blanco-Rey, M.; Mutombo, Pingo; Vondráček, Martin; Polyak, Yaroslav; Cháb, V.; Gago, José Ángel Martín; Jelı́nek, Pavel

doi:10.1103/physrevb.89.201412

Cited by 63 publications

(39 citation statements)

References 23 publications

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“…In those initial works 9,10 it was suggested that the interaction between Au substrate atoms and Ge is strong but limited to the submonolayer regime, or up to completion of the first monolayer, on top of which the true germanene grows 9 . This incorporation or mixing of substrate atoms into the Ge layer is not limited to Au substrates; a similar behaviour has been proposed for other films 23 and at present is a subject of debate and importance due to the effect that this may have on the family of new materials.…”

Section: A Introductionmentioning

confidence: 83%

“…In order to outline the role of the substrate and characterize in detail the film at all stages a combination of very sensitive surface techniques 23 is highly desirable, and in particular a technique such as direct recoil spectroscopy combined with Time of Flight analysis (TOF-DRS) 24 which is sensitive to all elements and can delineate unambiguously between top layer atoms and subsurface atoms becomes very powerful. In this work we studied the growth of Ge layers on Au(111) for different sample temperatures and evaporation rates and followed in situ the growth with TOF-DRS and LEED.…”

Section: A Introductionmentioning

confidence: 99%

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Growth of germanium on Au(111): formation of germanene or intermixing of Au and Ge atoms?

Cantero

Solis

Tong

et al. 2017

Phys. Chem. Chem. Phys.

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Section: A Introductionmentioning

confidence: 83%

Section: A Introductionmentioning

confidence: 99%

Growth of germanium on Au(111): formation of germanene or intermixing of Au and Ge atoms?

Cantero

Solis

Tong

et al. 2017

Phys. Chem. Chem. Phys.

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“…Other few-layer materials, such as silicene, are still just at the theoretical modeling stage, but large experimental efforts are currently underway to bring them into real applications. [5,6] An exciting development has just taken place with the first experimental synthesis of borophene, [7] whose existence had been theoretically predicted not long before. [8][9][10] The 2D character of these systems brings in unique physical properties, sometimes resulting in desirable qualities, such as high electron mobilities, or high thermal conductivities.…”

Section: Introductionmentioning

confidence: 99%

Physically founded phonon dispersions of few-layer materials and the case of borophene

Carrete

Lindsay

et al. 2016

Materials Research Letters

254

181

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By building physically sound interatomic force constants, we offer evidence of the universal presence of a quadratic phonon branch in all unstrained 2D materials, thus contradicting much of the existing literature. Through a reformulation of the interatomic force constants (IFCs) in terms of internal coordinates, we find that a delicate balance between the IFCs is responsible for this quadraticity. We use this approach to predict the thermal conductivity of Pmmn borophene, which is comparable to that of MoS 2 , and displays a remarkable in-plane anisotropy. These qualities may enable the efficient heat management of borophene devices in potential nanoelectronic applications. IMPACT STATEMENTThe newly found universality of quadratic dispersion will change the way 2D-material phonons are calculated. Predicted results for borophene shall become a fundamental reference for future research on this material. ARTICLE HISTORY

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“…[18] did not manage to achieve atomic resolution. However, in a recent paper by Švec et al [19] it was suggested that the Ge induced (19x19) reconstruction on Pt(111) is in fact a surface alloy composed of Ge3Pt tetramers that resembles a twisted kagome lattice.…”

mentioning

confidence: 99%

Germanene termination of Ge₂Pt crystals on Ge(110)

Bampoulis¹,

Zhang²,

Safaei³

et al. 2014

J. Phys.: Condens. Matter

166

183

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We have investigated the growth of Pt on Ge(110) using scanning tunneling microscopy and spectroscopy. The deposition of several monolayers of Pt on Ge(110) followed by annealing at 1100 K results in the formation of three-dimensional metallic Pt-Ge nanocrystals. The outermost layer of these crystals exhibits a honeycomb structure. The honeycomb structure is composed of two hexagonal sub-lattices that are displaced vertically by 0.2 Å with respect to each other. The nearest-neighbor distance of the atoms in the honeycomb lattice is 2.50.1 Å, i.e. very close to the predicted nearest-neighbor distance in germanene (2.4 Å). Scanning tunneling spectroscopy reveals that the atomic layer underneath the honeycomb layer is more metallic than the honeycomb layer itself. These observations are in line with a model recently proposed for metal di-(silicides/)germanides: a hexagonal crystal with metal layers separated by semiconductor layers with a honeycomb lattice. Based on our observations we propose that the outermost layer of the Ge2Pt nanocrystal is a germanene layer. Keywords: germanene, platinum, germaniumIn 2004 Novoselov and Geim [1] ignited a revolution in materials science by preparing graphene, i.e. a single layer of sp 2 hybrizided carbon atoms. The unique electronic structure of this archetype 2D material has led to a large number of exciting physical discoveries [2][3][4]. Shortly after this discovery it has been suggested that two-dimensional sheets of other group IV elements, such as Si [5,6] and Ge [6], might exhibit similar properties as graphene. Already in 1994 Takeda and Shiraishi [7] performed quantum mechanical ab initio calculations on planar silicon and germanium structures that have the graphite structure. They pointed out that the lowest energy configuration was obtained if the two atoms of the honeycomb are slightly displaced with respect to each other in a direction normal to the planar structure. Their calculations also revealed that these buckled Si and Ge structures exhibited semimetallic properties. Unfortunately, they did not pay any attention to the exact k-dependence of the energy dispersion relations in the vicinity of the Fermi level. More than a decade later Guzmán-Verri and Lew Yan Voon [5] showed, using tight binding calculations, that a 2D silicon sheet with the graphite structure has Dirac cones. Hence the electrons in these 2D 2 silicon sheets behave as massless Dirac fermions. The Si and Ge analogues of graphene are referred to as silicene and germanene, respectively. First-principles calculations by Cahangirov et al. [6] revealed that a single sheet of germanium atoms with a honeycomb structure is also stable. The free-standing Ge honeycomb lattice is not fully planar, but buckled. The two hexagonal sub-lattices of the honeycomb lattice are displaced vertically by 0.64 Å, which is slightly larger than the buckling in silicene (0.44 Å). The buckling results into a weaker  bonding and the perpendicular pz orbital hybridizes with the in-plane orbitals.Similar to graphene...

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Silicene versus two-dimensional ordered silicide: Atomic and electronic structure of Si-(19×19)R23.4∘/Pt(111)

Cited by 63 publications

References 23 publications

Growth of germanium on Au(111): formation of germanene or intermixing of Au and Ge atoms?

Growth of germanium on Au(111): formation of germanene or intermixing of Au and Ge atoms?

Physically founded phonon dispersions of few-layer materials and the case of borophene

Germanene termination of Ge₂Pt crystals on Ge(110)

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Silicene versus two-dimensional ordered silicide: Atomic and electronic structure of Si-(19×19)R23.4∘/Pt(111)

Cited by 63 publications

References 23 publications

Growth of germanium on Au(111): formation of germanene or intermixing of Au and Ge atoms?

Growth of germanium on Au(111): formation of germanene or intermixing of Au and Ge atoms?

Physically founded phonon dispersions of few-layer materials and the case of borophene

Germanene termination of Ge2Pt crystals on Ge(110)

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Germanene termination of Ge₂Pt crystals on Ge(110)