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Article Dans Une Revue Physical Review Letters Année : 2020

Hyperuniform monocrystalline structures by spinodal solid-state dewetting

Résumé

Materials featuring anomalous suppression of density fluctuations over large length scales are emerging systems known as disordered hyperuniform. The underlying hidden order renders them appealing for several applications, such as light management and topologically protected electronic states. These applications require scalable fabrication, which is hard to achieve with available top-down approaches. Theoretically, it is known that spinodal decomposition can lead to disordered hyperuniform architectures. Spontaneous formation of stable patterns could thus be a viable path for the bottom-up fabrication of these materials. Here we show that mono-crystalline semiconductor-based structures, in particular Si1−xGex layers deposited on silicon-on-insulator substrates, can undergo spinodal solid-state dewetting featuring correlated disorder with an effective hyperuniform character. Nano-to micro-metric sized structures targeting specific morphologies and hyperuniform character can be obtained, proving the generality of the approach and paving the way for technological applications of disordered hyperuniform metamaterials. Phase-field simulations explain the underlying non-linear dynamics and the physical origin of the emerging patterns. Disordered hyperuniform materials are an emerging class of systems featuring anomalous suppression of density fluctuations on large length scales [1-5]. While not presenting any Bragg peak in diffraction (as a liquid), they have strongly suppressed density fluctuations at long distances (as an ordered crystal). The underlying hidden order results in exotic phenomena, such as topo-logically protected electronic states [6], glassy electronic quantum state transitions [7], Anderson localization of light [8], polarization selectivity [9], lasing [10] and a full photonic band-gap for light propagation [11-14]. Patterns exhibiting correlated disorder are ubiquitous in nature and are typical of many phenomena ruled by far-from-equilibrium processes [15, 16]. Prominent examples are morphogenesis in biological systems [17], thin-layer wrinkling [18, 19], and phase separation [20]. In these systems the presence of interactions and the underlying non-linear dynamics, lead to the formation of complex patterns eventually featuring correlated disorder [21]. Such patterns can emerge from phenomena involving long-range interactions and have been reported in thin films of polymers [22, 23] and liquid metals [21]. Moreover, phase separation by spinodal decomposition has been recently proposed as a possible bottom-up process for producing hyperuniform materials [24, 25]. Liquid thin films of metals and polymers can break and dewet through the amplification of uniformly dis
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Dates et versions

hal-02974159 , version 1 (21-10-2020)

Identifiants

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Marco Salvalaglio, Mohammed Bouabdellaoui, Monica Bollani, Abdennacer Benali, Luc Favre, et al.. Hyperuniform monocrystalline structures by spinodal solid-state dewetting. Physical Review Letters, 2020, 125, pp.126101. ⟨10.1103/PhysRevLett.125.126101⟩. ⟨hal-02974159⟩
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