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  1. Artikel ; Online: Physical Properties of an Aperiodic Monotile with Graphene-like Features, Chirality, and Zero Modes.

    Schirmann, Justin / Franca, Selma / Flicker, Felix / Grushin, Adolfo G

    Physical review letters

    2024  Band 132, Heft 8, Seite(n) 86402

    Abstract: The discovery of the Hat, an aperiodic monotile, has revealed novel mathematical aspects of aperiodic tilings. However, the physics of particles propagating in such a setting remains unexplored. In this work we study spectral and transport properties of ... ...

    Abstract The discovery of the Hat, an aperiodic monotile, has revealed novel mathematical aspects of aperiodic tilings. However, the physics of particles propagating in such a setting remains unexplored. In this work we study spectral and transport properties of a tight-binding model defined on the Hat. We find that (i) the spectral function displays striking similarities to that of graphene, including sixfold symmetry and Dirac-like features; (ii) unlike graphene, the monotile spectral function is chiral, differing for its two enantiomers; (iii) the spectrum has a macroscopic number of degenerate states at zero energy; (iv) when the magnetic flux per plaquette (ϕ) is half of the flux quantum, zero modes are found localized around the reflected "anti-hats"; and (v) its Hofstadter spectrum is periodic in ϕ, unlike for other quasicrystals. Our work serves as a basis to study wave and electron propagation in possible experimental realizations of the Hat, which we suggest.
    Sprache Englisch
    Erscheinungsdatum 2024-03-08
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.132.086402
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Non-Hermitian Physics without Gain or Loss: The Skin Effect of Reflected Waves.

    Franca, Selma / Könye, Viktor / Hassler, Fabian / van den Brink, Jeroen / Fulga, Cosma

    Physical review letters

    2022  Band 129, Heft 8, Seite(n) 86601

    Abstract: Physically, one tends to think of non-Hermitian systems in terms of gain and loss: the decay or amplification of a mode is given by the imaginary part of its energy. Here, we introduce an alternative avenue to the realm of non-Hermitian physics, which ... ...

    Abstract Physically, one tends to think of non-Hermitian systems in terms of gain and loss: the decay or amplification of a mode is given by the imaginary part of its energy. Here, we introduce an alternative avenue to the realm of non-Hermitian physics, which involves neither gain nor loss. Instead, complex eigenvalues emerge from the amplitudes and phase differences of waves backscattered from the boundary of insulators. We show that for any strong topological insulator in a Wigner-Dyson class, the reflected waves are characterized by a reflection matrix exhibiting the non-Hermitian skin effect. This leads to an unconventional Goos-Hänchen effect: due to non-Hermitian topology, waves undergo a lateral shift upon reflection, even at normal incidence. Going beyond systems with gain and loss vastly expands the set of experimental platforms that can access non-Hermitian physics and show signatures associated with non-Hermitian topology.
    Sprache Englisch
    Erscheinungsdatum 2022-05-24
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.129.086601
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Disorder-Induced Magnetotransport Anomalies in Amorphous and Textured Co

    Molinari, Alan / Balduini, Federico / Rocchino, Lorenzo / Wawrzyńczak, Rafał / Sousa, Marilyne / Bui, Holt / Lavoie, Christian / Stanic, Vesna / Jordan-Sweet, Jean / Hopstaken, Marinus / Tchoumakov, Serguei / Franca, Selma / Gooth, Johannes / Fratini, Simone / Grushin, Adolfo G / Zota, Cezar / Gotsmann, Bernd / Schmid, Heinz

    ACS applied electronic materials

    2023  Band 5, Heft 5, Seite(n) 2624–2637

    Abstract: In recent times the chiral semimetal cobalt monosilicide (CoSi) has emerged as a prototypical, nearly ideal topological conductor hosting giant, topologically protected Fermi arcs. Exotic topological quantum properties have already been identified in ... ...

    Abstract In recent times the chiral semimetal cobalt monosilicide (CoSi) has emerged as a prototypical, nearly ideal topological conductor hosting giant, topologically protected Fermi arcs. Exotic topological quantum properties have already been identified in CoSi bulk single crystals. However, CoSi is also known for being prone to intrinsic disorder and inhomogeneities, which, despite topological protection, risk jeopardizing its topological transport features. Alternatively, topology may be stabilized by disorder, suggesting the tantalizing possibility of an amorphous variant of a topological metal, yet to be discovered. In this respect, understanding how microstructure and stoichiometry affect magnetotransport properties is of pivotal importance, particularly in case of low-dimensional CoSi thin films and devices. Here we comprehensively investigate the magnetotransport and magnetic properties of ≈25 nm Co
    Sprache Englisch
    Erscheinungsdatum 2023-04-25
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 2637-6113
    ISSN (online) 2637-6113
    DOI 10.1021/acsaelm.3c00095
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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