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Fernández Sánchez, Evamaría

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0000-0003-2085-0478
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Fernández Sánchez
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Evamaría
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Author: Santalla, Silvia N. × search.filters.applied.f.itemFacultad: Facultad de Ciencias ×

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Now showing 1 - 2 of 2
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    Ergotropy and entanglement in critical spin chains
    (American Physical Society, 2023-02-08) Mula, Begoña; Fernández, Julio J.; Santalla, Silvia N.; Alvarellos Bermejo, José Enrique; García Aldea, David; Rodríguez Laguna, Javier; Fernández Sánchez, Evamaría
    A subsystem of an entangled ground state (GS) is in a mixed state. Thus, if we isolate this subsystem from its surroundings, we may be able to extract work applying unitary transformations, up to a maximal amount which is called ergotropy. Once this work has been extracted, the subsystem will still contain some bound energy above its local GS, which can provide valuable information about the entanglement structure. We show that the bound energy for half a free fermionic chain decays as the square of the entanglement entropy divided by the chain length, thus approaching zero for large system sizes, and we conjecture that this relation holds for all one-dimensional critical states.
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    Nanowire reconstruction under external magnetic fields
    (AIP, 2020-12-23) Santalla, Silvia N.; Rodríguez Laguna, Javier; Fernández Sánchez, Evamaría; Alvarellos Bermejo, José Enrique; Rodríguez Laguna, Javier; Fernández Sánchez, Evamaría
    We consider the different structures that a magnetic nanowire adsorbed on a surface may adopt under the influence of external magnetic or electric fields. First, we propose a theoretical framework based on an Ising-like extension of the 1D Frenkel–Kontorova model, which is analyzed in detail using the transfer matrix formalism, determining a rich phase diagram displaying structural reconstructions at finite fields and an antiferromagnetic–paramagnetic phase transition of second order. Our conclusions are validated using ab initio calculations with density functional theory, paving the way for the search of actual materials where this complex phenomenon can be observed in the laboratory.