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  1. Article: Surface Phase Nucleation of Lead Monoatomic Layers on Si(111) Induced by Manganese Phthalocyanine Molecules

    Longo, Danilo / Bocquet, Marie-Laure / Lorente, Nicolás / Cruguel, Hervé / Debontridder, François / Royer, Sébastien / David, Pascal / Palacio-Morales, Alexandra / Cren, Tristan / Witkowski, Nadine / Brun, Christophe

    Journal of physical chemistry. 2020 Aug. 26, v. 124, no. 36

    2020  

    Abstract: Hybrid interfaces where organic molecules are adsorbed on metallic substrates are very interesting to understand the fundamental interactions that might modify the chemical–physical properties of molecules or substrate. Here, we explore the adsorption of ...

    Abstract Hybrid interfaces where organic molecules are adsorbed on metallic substrates are very interesting to understand the fundamental interactions that might modify the chemical–physical properties of molecules or substrate. Here, we explore the adsorption of manganese phthalocyanines (MnPcs) on different structural phases of a Pb monatomic layer, namely, the √7 × √3-Pb and the striped incommensurate phase (SIC-Pb) phase, grown on Si(111). Surprisingly, the deposition of a minute amount of MnPc molecules (∼0.18 molecules/100 nm²) nucleates a macroscopic structural transition of the √7 × √3-Pb phase into the SIC-Pb phase. Our combined scanning tunneling microscopy, low-energy electron diffraction, and density functional theory study revealed that the mechanism behind this surface transformation is related to a strong and local molecule–substrate interaction. The structural phase transition is finally driven by the strained nature of the Pb phases and the energetic stability of the MnPc/SIC-Pb/Si(111) system with respect to the MnPc/√7 × √3-Pb/Si(111) one. The molecule–substrate interaction found in the present study is stronger than the one observed on Pb(111) bulk or thin films, highlighting the implication of the Pb/Si(111) interface in the interaction process. Hence, our results reveal that playing with the substrate dimensionality to tune the molecule–substrate coupling has strong impact on the electronic/magnetic properties of organic hybrid systems.
    Keywords adsorption ; density functional theory ; magnetism ; manganese ; phase transition
    Language English
    Dates of publication 2020-0826
    Size p. 19829-19840.
    Publishing place American Chemical Society
    Document type Article
    Note NAL-AP-2-clean
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.0c05278
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Coupling of Coexisting Noncollinear Spin States in the Fe Monolayer on Re(0001).

    Palacio-Morales, Alexandra / Kubetzka, André / von Bergmann, Kirsten / Wiesendanger, Roland

    Nano letters

    2016  Volume 16, Issue 10, Page(s) 6252–6256

    Abstract: Spin-polarized scanning tunneling microscopy is used to investigate the magnetic state of the Fe monolayer on Re(0001). Two coexisting atomic-scale noncollinear spin textures are observed with a sharp transition between them on the order of the atomic ... ...

    Abstract Spin-polarized scanning tunneling microscopy is used to investigate the magnetic state of the Fe monolayer on Re(0001). Two coexisting atomic-scale noncollinear spin textures are observed with a sharp transition between them on the order of the atomic lattice spacing. A position correlation between the two spin states is observed both in experiments and in Monte Carlo simulations, demonstrating their coupling behavior.
    Language English
    Publishing date 2016-09-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.6b02528
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Atomic-scale interface engineering of Majorana edge modes in a 2D magnet-superconductor hybrid system.

    Palacio-Morales, Alexandra / Mascot, Eric / Cocklin, Sagen / Kim, Howon / Rachel, Stephan / Morr, Dirk K / Wiesendanger, Roland

    Science advances

    2019  Volume 5, Issue 7, Page(s) eaav6600

    Abstract: Topological superconductors are predicted to harbor exotic boundary states-Majorana zero-energy modes-whose non-Abelian braiding statistics present a new paradigm for the realization of topological quantum computing. Using low-temperature scanning ... ...

    Abstract Topological superconductors are predicted to harbor exotic boundary states-Majorana zero-energy modes-whose non-Abelian braiding statistics present a new paradigm for the realization of topological quantum computing. Using low-temperature scanning tunneling spectroscopy, here, we report on the direct real-space visualization of chiral Majorana edge states in a monolayer topological superconductor, a prototypical magnet-superconductor hybrid system composed of nanoscale Fe islands of monoatomic height on a Re(0001)-O(2 × 1) surface. In particular, we demonstrate that interface engineering by an atomically thin oxide layer is crucial for driving the hybrid system into a topologically nontrivial state as confirmed by theoretical calculations of the topological invariant, the Chern number.
    Language English
    Publishing date 2019-07-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.aav6600
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors.

    Kim, Howon / Palacio-Morales, Alexandra / Posske, Thore / Rózsa, Levente / Palotás, Krisztián / Szunyogh, László / Thorwart, Michael / Wiesendanger, Roland

    Science advances

    2018  Volume 4, Issue 5, Page(s) eaar5251

    Abstract: Realizing Majorana bound states (MBS) in condensed matter systems is a key challenge on the way toward topological quantum computing. As a promising platform, one-dimensional magnetic chains on conventional superconductors were theoretically predicted to ...

    Abstract Realizing Majorana bound states (MBS) in condensed matter systems is a key challenge on the way toward topological quantum computing. As a promising platform, one-dimensional magnetic chains on conventional superconductors were theoretically predicted to host MBS at the chain ends. We demonstrate a novel approach to design of model-type atomic-scale systems for studying MBS using single-atom manipulation techniques. Our artificially constructed atomic Fe chains on a Re surface exhibit spin spiral states and a remarkable enhancement of the local density of states at zero energy being strongly localized at the chain ends. Moreover, the zero-energy modes at the chain ends are shown to emerge and become stabilized with increasing chain length. Tight-binding model calculations based on parameters obtained from ab initio calculations corroborate that the system resides in the topological phase. Our work opens new pathways to design MBS in atomic-scale hybrid structures as a basis for fault-tolerant topological quantum computing.
    Language English
    Publishing date 2018-05-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.aar5251
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Book ; Online: Misfit layer compounds

    Leriche, Raphaël T. / Palacio-Morales, Alexandra / Campetella, Marco / Tresca, Cesare / Sasaki, Shunsuke / Brun, Christophe / Debontridder, François / David, Pascal / Arfaoui, Imad / Šofranko, Ondrej / Samuely, Tomas / Kremer, Geoffroy / Monney, Claude / Jaouen, Thomas / Cario, Laurent / Calandra, Matteo / Cren, Tristan

    a platform for heavily-doped two-dimensional transition metal dichalcogenides

    2020  

    Abstract: Transition metal dichalcogenides (TMDs) display a rich variety of instabilities such as spin and charge orders, Ising superconductivity and topological properties. Their physical properties can be controlled by doping in electric double-layer field- ... ...

    Abstract Transition metal dichalcogenides (TMDs) display a rich variety of instabilities such as spin and charge orders, Ising superconductivity and topological properties. Their physical properties can be controlled by doping in electric double-layer field-effect transistors (FET). However, for the case of single layer NbSe$_2$, FET doping is limited to $\approx 1\times 10^{14}$ cm$^{-2}$, while a somewhat larger charge injection can be obtained via deposition of K atoms. Here, by performing ARPES, STM, quasiparticle interference measurements, and first principles calculations we show that a misfit compound formed by sandwiching NbSe$_2$ and LaSe layers behaves as a NbSe$_2$ single layer with a rigid doping of $0.55-0.6$ electrons per Nb atom or $\approx 6\times 10^{14}$ cm$^{-2}$. Due to this huge doping, the $3\times3$ charge density wave is replaced by a $2\times2$ order with very short coherence length. As a tremendous number of different misfit compounds can be obtained by sandwiching TMDs layers with rock salt or other layers, our work paves the way to the exploration of heavily doped 2D TMDs over an unprecedented wide range of doping.
    Keywords Condensed Matter - Materials Science
    Subject code 620
    Publishing date 2020-10-23
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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