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arXiv · 2611.08605

Experimental realization of twofold topological phase transition induced by long-range hoppings in one-dimensional chains

J. A. Franco-Medrano·B. Manjarrez-Montañez·E. Flores-Olmedo·G. Báez·A. M. Martínez-Argüello·Y. Betancur-Ocampo·R. A. Méndez-Sánchez
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Abstract

Long-range hoppings offer a powerful mechanism to engineer exotic topological phases beyond conventional tight-binding models. Here, we experimentally demonstrate a twofold topological phase transition driven by third-nearest-neighbor couplings in a one-dimensional phononic chain that emulates cis-polyacetylene. Tunable hopping parameters in highly structured aluminum plates allow us to observe the emergence of Dirac points, a valley pseudospin structure, and topological edge states. The experimental results are supported by non-equilibrium Green's function transport calculations. Our findings confirm the predicted long-range phase diagram and establish phononic metamaterials as a versatile platform for exploring topological phenomena beyond the Su-Schrieffer-Heeger paradigm.

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J. A. Franco-Medrano, B. Manjarrez-Montañez, E. Flores-Olmedo, G. Báez, A. M. Martínez-Argüello, Y. Betancur-Ocampo, R. A. Méndez-Sánchez. 2026-11-05. Experimental realization of twofold topological phase transition induced by long-range hoppings in one-dimensional chains. https://arxiv.org/abs/2611.08605

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