MPMarco Papagno

Marco Papagno

University of Calabria
*This is an algorithmically generated author record based on publicly available information.
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Marco Papagno has a total of 241 co-authors. Here are the top co-authors by number of shared publications:

Latest Publications

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    Epitaxial growth of β -bismuthene on Sb 2 Te 3

    by Giorgia Sementilli, Arslan Masood, Fabio Ronci, Stefano Colonna, Marilena Carbone, Marco Papagno, Ziya S. Aliev, Evgueni V. Chulkov, Sergey V. Eremeev, Roberto Flammini

    Over the past decades, two-dimensional crystals have attracted considerable interest as promising materials for electronic and optoelectronic applications. Among them, graphene analogs composed of heavy atoms occupy a particularly distinctive niche due to their enhanced spin-orbit interaction. Here, we present an epitaxial heterointerface formed by $\ensuremath{\beta}$-bismuthene on ${\mathrm{Sb}}_{2}{\mathrm{Te}}_{3}$, a well-known three-dimensional topological insulator. Using scanning tunneling microscopy, we systematically investigated the effects of Bi coverage and substrate temperature on nucleation processes, island morphology, and atomic structure. In addition, substrate-induced defects were identified throughout the bismuthene lattice.

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    Interface effects of Pb films on TlBiSe 2 and Bi 2 Se 3 topological insulators

    by Roberto Flammini, Oreste De Luca, Martina Casciaro, Tommaso Caruso, Fabio Biffoli, Daniela Pacilé, Khatira Z. Mehtiyeva, Ziya S. Aliev, Alexey Barinov, Alfonso Policicchio, et al.

    We present an experimental investigation of the Pb-induced changes on the electronic structure of selected topological insulators, namely, TlBiSe 2 and Bi 2 Se 3 . Using spatially resolved and surface-sensitive techniques, including micro-angle-resolved photoemission ( μ -ARPES) and micro-core-level photoemission ( μ -PES), we track the evolution of the electronic states during adsorbate growth. For low Pb coverage on TlBiSe 2 , we identify the formation of a disordered interface. For thicker films, μ -ARPES measurements clearly resolve well-defined electron confinement (quantum well) states within the metallic Pb layers and no migration of the topological surface state onto the Pb film is observed. Furthermore, μ -PES results on both Pb/ TlBiSe 2 and Pb/ Bi 2 Se 3 heterostructures can be rationalized in terms of a significant chemical interaction between Pb and Se, leading to substantial surface degradation and Bi atom segregation. The modeling performed on the adsorption of lead on topological insulator surfaces, which includes the consideration of the swapping of Pb adsorbates with Bi substrate atoms, validates the scenario derived from experimental observations. It also suggests that the development of a disordered interface is due to the formation of PbSe nuclei, whose size is constrained by the compressive stresses exerted by the TI substrate.

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    Molecular Packing Governed by a Single Carbon Atom: Odd–Even Effects in 4- n -Alkyloxybenzoic Acids on Au(111)

    by Oreste De Luca, Francesco Petrone, Michele Pisarra, Fabian Cossidente, Martina Casciaro, Tommaso Caruso, Eugenia Giorno, Iolinda Aiello, Nicolas Godbert, Daniela Pacilè, et al.

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    Electronic structure of a p -type topological insulator SnSbBiTe 4

    by S.V. Eremeev, L. Ferrari, P.M. Sheverdyaeva, O. De Luca, T. Caruso, M. Casciaro, Kh.Z. Mehtiyeva, Z.S. Aliev, E.V. Chulkov, A.S. Vasenko, et al.

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    Mastering the growth of antimonene on Bi2Se3: Strategies and insights

    by Roberto Flammini, Conor Hogan, Stefano Colonna, Fabio Ronci, Mauro Satta, Marco Papagno, Ziya S. Aliev, Sergey V. Eremeev, Evgueni V. Chulkov, Zipporah R. Benher, et al.

    Antimonene, the two-dimensional phase of antimony, appears in two distinct allotropes when epitaxially grown on Bi2Se3: the puckered asymmetric washboard (α) and buckled honeycomb (β) bilayer structures. As-deposited antimony films exhibit varying proportions of single α and β structures. We identify the conditions necessary for ordered, pure-phase growth of single to triple β-antimonene bilayers. Additionally, we determine their electronic structure, work function, and characteristic core-level binding energies, offering an explanation for the relatively large chemical shifts observed among the different phases. This study not only establishes a protocol for achieving a single β phase of antimonene but also provides key signatures for distinguishing between the different allotropes using standard spectroscopic and microscopic techniques.

    Cited by 5
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    Imaging of twisted monolayers in three-dimensional nanoporous graphene

    by Oreste De Luca, Antonio Palamara, Michele Pisarra, Francesca Mazzei, Tommaso Caruso, Giovanni Desiderio, Dario Marchiani, Riccardo Frisenda, Samuel Jeong, Yoshikazu Ito, et al.

    Cited by 1
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    Floating of the topological surface state on top of a thick lead layer: The case of the Pb/Bi2Se3 interface

    by Oreste De Luca, Igor A. Shvets, Sergey V. Eremeev, Ziya S. Aliev, Marek Kopciuszynski, Alexey Barinov, Fabio Ronci, Stefano Colonna, Evgueni V. Chulkov, Raffaele G. Agostino, et al.

    The puzzling question about the floating of the topological surface state on top of a thick Pb layer has now possibly been answered. A photoemission study of the interface made by Pb on Bi2Se3 for different temperatures and adsorbate coverage conditions, allowed us to demonstrate that the evidence reported in the literature can be related to the surface diffusion phenomenon exhibited by the Pb atoms, which leaves the substrate partially uncovered. Comprehensive density functional theory calculations show that despite the specific arrangement of the atoms at the interface, the topological surface state cannot float on top of the adlayer but rather tends to move inward within the substrate.

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    Nearly-freestanding supramolecular assembly with tunable structural properties

    by Tommaso Caruso, Oreste De Luca, Nicola Melfi, Alfonso Policicchio, Michele Pisarra, Nicolas Godbert, Iolinda Aiello, Eugenia Giorno, Daniela Pacilè, Paolo Moras, et al.

    The synthesis and design of two-dimensional supramolecular assemblies with specific functionalities is one of the principal goals of the emerging field of molecule-based electronics, which is relevant for many technological applications. Although a large number of molecular assemblies have been already investigated, engineering uniform and highly ordered two-dimensional molecular assemblies is still a challenge. Here we report on a novel approach to prepare wide highly crystalline molecular assemblies with tunable structural properties. We make use of the high-reactivity of the carboxylic acid functional moiety and of the predictable structural features of non-polar alkane chains to synthesize 2D supramolecular assemblies of 4-(decyloxy)benzoic acid (4DBA;C\(_{17}\)H\(_{26}\)O\(_{3}\)) on a Au(111) surface. By means of scanning tunneling microscopy, density functional theory calculations and photoemission spectroscopy, we demonstrate that these molecules form a self-limited highly ordered and defect-free two-dimensional single-layer film of micrometer-size, which exhibits a nearly-freestanding character. We prove that by changing the length of the alkoxy chain it is possible to modify in a controlled way the molecular density of the “floating” overlayer without affecting the molecular assembly. This system is especially suitable for engineering molecular assemblies because it represents one of the few 2D molecular arrays with specific functionality where the structural properties can be tuned in a controlled way, while preserving the molecular pattern.

    Cited by 4
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    Energy-overlap of the Dirac surface state with bulk bands in SnBi2Te4

    by S. V. Eremeev, O. De Luca, P. M. Sheverdyaeva, L. Ferrari, A. V. Matetskiy, G. Di Santo, L. Petaccia, C. Crovara, T. Caruso, M. Papagno, et al.

    Topological insulators in which the Fermi level is in the bulk gap and intersects only a topological surface state (the Dirac cone) are of special interest in the current research. In the last decades, a fine-tuning of the chemical composition of topological insulators has been carefully explored in order to control the Fermi level position with respect to the Dirac surface state. Taking the SnBi2Te4 crystal as a case study, we provide a characterization of its electronic structure by means of angle-resolved photoemission spectroscopy and first-principles calculations. We show that, going away from the Brillouin zone center, bulk band states energetically overlap with the Dirac cone at the Fermi level, thus providing an unwanted as well as hidden contribution to the transport properties of the material. In addition, the comparison between experimental results of the band structure with state-of-the-art simulations, implemented taking into account the number of defects, leads to useful insights on the existing limits in the description of this material.

    Cited by 10
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    One-dimensional Rashba states with unconventional spin texture in Bi chains

    by P. M. Sheverdyaeva, D. Pacilè, D. Topwal, U. Manju, M. Papagno, V. Feyer, M. Jugovac, G. Zamborlini, I. Cojocariu, C. Tusche, et al.

    Spin-polarized electrons confined in low-dimensional structures are of high interest for spintronics applications. Here, we investigate the electronic structure of an ordered array of Bi monomer and dimer chains on the Ag(110) surface. By means of spin-resolved photoemission spectroscopy, we find Rashba-Bychkov split bands crossing the Fermi level with one-dimensional constant energy contours. These bands are up-spin polarized for positive wave vectors and down-spin polarized for negative wave vectors, at variance with the Rashba-Bychkov model that predicts a pair of states with opposite spin in each half of the surface Brillouin zone. Density functional theory shows that spin-selective hybridization with the Ag bulk bands originates this unconventional spin texture.

    Cited by 8
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