A chemically inert Rashba split interface electronic structure of C<sub>60</sub>, FeOEP and PTCDA on BiAg<sub>2</sub>/Ag(111) substrates

Cottin, M. C.; Lobo-Checa, Jorge; Schaffert, Johannes; Bobisch, C. A.; Möller, R.; Ortega, J. E.; Walter, Andrew L.

doi:10.1088/1367-2630/16/4/045002

Cited by 14 publications

(18 citation statements)

References 23 publications

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“…In the future, research on 2D donor–acceptor networks should be directed towards synthesis on more functional surfaces. Ferromagnetic surfaces, and in general, spin‐textured substrates, such as Rashba‐split materials, are also interesting beyond the fundamental point of view for spintronics applications. In fact, molecule–covered ferromagnets are more resistant to the environment, although one needs to transfer the spin texture to the molecular layer.…”

Section: Discussionmentioning

confidence: 99%

Multi‐Component Organic Layers on Metal Substrates

et al. 2015

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Increasingly high hopes are being placed on organic semiconductors for a variety of applications. Progress along these lines, however, requires the design and growth of increasingly complex systems with well-defined structural and electronic properties. These issues have been studied and reviewed extensively in single-component layers, but the focus is gradually shifting towards more complex and functional multi-component assemblies such as donor-acceptor networks. These blends show different properties from those of the corresponding single-component layers, and the understanding on how these properties depend on the different supramolecular environment of multi-component assemblies is crucial for the advancement of organic devices. Here, our understanding of two-dimensional multi-component layers on solid substrates is reviewed. Regarding the structure, the driving forces behind the self-assembly of these systems are described. Regarding the electronic properties, recent insights into how these are affected as the molecule's supramolecular environment changes are explained. Key information for the design and controlled growth of complex, functional multicomponent structures by self-assembly is summarized.

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Section: Discussionmentioning

confidence: 99%

Multi‐Component Organic Layers on Metal Substrates

et al. 2015

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“…Takayama et al [97] use thin films of Sb(111) and Bi(111) on Si to study the Rashba-split surface states by spin-resolved ARPES: a reduction of the spin polarization away from the surface Brillouin zone center is observed for Sb which does not appear for Bi and indicates strong interaction with bulk states. Ultrathin Bi films on an insulating substrate permit an investigation of transport effects of the Rashba- [101] to grow organic molecules which interact very weakly with the substrate so that the surface state is also unaffected. Using ARPES, Bentmann and Reinert [102] show that Na deposition enhances the Rashba splitting of the Bi/Cu(111) surface alloy whereas it is reduced by Xe.…”

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confidence: 99%

Focus on the Rashba effect

2015

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The Rashba effect, discovered in 1959, continues to supply fertile ground for fundamental research and applications. It provided the basis for the proposal of the spin transistor by Datta and Das in 1990, which has largely inspired the broad and dynamic field of spintronics. More recent developments include new materials for the Rashba effect such as metal surfaces, interfaces and bulk materials. It has also given rise to new phenomena such as spin currents and the spin Hall effect, including its quantized version, which has led to the very active field of topological insulators. The Rashba effect plays a crucial role in yet more exotic fields of physics such as the search for Majorana fermions at semiconductorsuperconductor interfaces and the interaction of ultracold atomic Bose and Fermi gases. Advances in our understanding of Rashba-type spin-orbit couplings, both qualitatively and quantitatively, can be obtained in many different ways. This focus issue brings together the wide range of research activities on Rashba physics to further promote the development of our physical pictures and concepts in this field. The present Editorial gives a brief account on the history of the Rashba effect including material that was previously not easily accessible before summarizing the key results of the present focus issue as a guidance to the reader.

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“…This effect leads to an increase of the energy of the electrons and consequently to the upward energy shift of the surface state. Moreover, recent angle-resolved photoemission spectroscopy (ARPES) experiments also reveal that adsorption of the atoms or molecules with closed shells such as rare gas Xe, C 60 , iron octaethylporphyrin (FeOEP), or perylenetetracarboxylic dianhydride (PTCDA) on the surface of the BiAg 2 alloy does not lead to the energy shift of these Rashba-split states and k splitting remains intact [40,41].…”

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confidence: 99%

Local electronic properties of the graphene-protected giant Rashba-split BiAg2 surface

et al. 2017

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We report the preparation of an interface between graphene and a strong Rashba-split BiAg 2 surface alloy and an investigation of its structure as well as the electronic properties by means of scanning tunneling microscopy/spectroscopy and density functional theory calculations. Upon evaluation of the quasiparticle interference patterns, an unperturbed linear dispersion for the π band of n-doped graphene is observed. Our results also reveal the intact nature of the giant Rashba-split surface states of the BiAg 2 alloy, which demonstrate only a moderate downward energy shift due to the presence of graphene. This effect is explained in the framework of density functional theory by an inward relaxation of the Bi atoms at the interface and subsequent delocalization of the wave function of the surface states. Our findings demonstrate a realistic pathway to prepare a graphene-protected giant Rashba-split BiAg 2 for possible spintronic applications. DOI: 10.1103/PhysRevB.95.155428 Graphene has attracted much attention due to its unique transport, electronic, and elastic properties [1][2][3]. Taking into account these characteristics, many practical applications of graphene have been proposed. The most promising are graphene-based touch screens, which will potentially replace indium-tin-oxide (ITO-) based screens in the future [4,5], batteries and supercapacitors [6][7][8], and composite materials [9,10]. Above that, a single atom thick graphene layer can effectively protect the underlying material against oxidation and/or corrosion [11,12]. This property is particularly exciting when graphene is deposited or formed on the surface of a ferromagnet or a material which exhibits strong spin-orbit interaction [13][14][15][16][17][18][19]. Here, interfacial contact between graphene and the respective material might lead to the appearance of different new phenomena in graphene and at the interface, such as induced magnetism in graphene [20][21][22], possible induced spin-orbit splitting of the graphene π states [23,24], conservation of spin-polarized electron emission from the underlying ferromagnetic material [13,15], etc.Previously published works on the adsorption of graphene on the surfaces of heavy materials, such as Ir (111) and Au(111), demonstrate that such contacts only weakly modify the dispersion of the spin-orbit split surface states of the metal surface. Adsorption of graphene merely leads to a rigid shift of the respective surface states to smaller binding energies [16,25,26], which was explained by the stronger localization of the surface state wave function, leading to a corresponding energy shift. At the same time, the intercalation of Au in the graphene/Ni(111) interface leads to the appearance of induced spin-orbit splitting of the graphene π states (up to ≈100 meV) as a result of the hybridization of these states and valence band states of the underlying heavy metal [23,24]. Here, the energetically unfavorable model of diluted Au atoms underneath graphene on Ni (111) Here, we report the fabrication of ...

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A chemically inert Rashba split interface electronic structure of C₆₀, FeOEP and PTCDA on BiAg₂/Ag(111) substrates

Cited by 14 publications

References 23 publications

Multi‐Component Organic Layers on Metal Substrates

Multi‐Component Organic Layers on Metal Substrates

Focus on the Rashba effect

Local electronic properties of the graphene-protected giant Rashba-split BiAg2 surface

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A chemically inert Rashba split interface electronic structure of C60, FeOEP and PTCDA on BiAg2/Ag(111) substrates

Cited by 14 publications

References 23 publications

Multi‐Component Organic Layers on Metal Substrates

Multi‐Component Organic Layers on Metal Substrates

Focus on the Rashba effect

Local electronic properties of the graphene-protected giant Rashba-split BiAg2 surface

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A chemically inert Rashba split interface electronic structure of C₆₀, FeOEP and PTCDA on BiAg₂/Ag(111) substrates