Artículo
Bifurcation analysis and phase diagram of a spin-string model with buckled states
Autor/es | Ruiz García, M.
Bonilla, L. L. Prados Montaño, Antonio |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2017 |
Fecha de depósito | 2020-04-28 |
Publicado en |
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Resumen | We analyze a one-dimensional spin-string model, in which string oscillators are linearly coupled to their two
nearest neighbors and to Ising spins representing internal degrees of freedom. String-spin coupling induces ... We analyze a one-dimensional spin-string model, in which string oscillators are linearly coupled to their two nearest neighbors and to Ising spins representing internal degrees of freedom. String-spin coupling induces a long-range ferromagnetic interaction among spins that competes with a spin-spin antiferromagnetic coupling. As a consequence, the complex phase diagram of the system exhibits different flat rippled and buckled states, with first or second order transition lines between states. This complexity translates to the two-dimensional version of the model, whose numerical solution has been recently used to explain qualitatively the rippled to buckled transition observed in scanning tunneling microscopy experiments with suspended graphene sheets. Here we describe in detail the phase diagram of the simpler one-dimensional model and phase stability using bifurcation theory. This gives additional insight into the physical mechanisms underlying the different phases and the behavior observed in experiments. |
Cita | Ruiz García, M., Bonilla, L.L. y Prados Montaño, A. (2017). Bifurcation analysis and phase diagram of a spin-string model with buckled states. Physical Review E, 96 (6), 062147. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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pubPhysRevE.96.062147.pdf | 1.117Mb | [PDF] | Ver/ | |