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Título:
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Uhlmann phase as a topological measure for one-dimensional fermion systems
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Autores:
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Viyuela, O. ;
Rivas, A. ;
Martín-Delgado Alcántara, Miguel Ángel
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2014-04-02
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física-Modelos matemáticos
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Tipo = Artículo
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Resumen:
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We introduce the Uhlmann geometric phase as a tool to characterize symmetry-protected topological phases in one-dimensional fermion systems, such as topological insulators and superconductors. Since this phase is formulated for general mixed quantum states, it provides a way to extend topological properties to finite temperature situations. We illustrate these ideas with some paradigmatic models and find that there exists a critical temperature Tc at which the Uhlmann phase goes discontinuously and abruptly to zero. This stands as a borderline between two different topological phases as a function of the temperature. Furthermore, at small temperatures we recover the usual notion of topological phase in fermion systems.
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En línea:
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https://eprints.ucm.es/id/eprint/47356/1/Mart%C3%ADn%20Delgado%20Alc%C3%A1ntara%20M%C3%81%2006%20LIBRE.pdf
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