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The Cd1-xZnxTe semiconductor alloy is a regular system regarding itsmacroscopic mechanic properties in that its experimental bulk modulus exhibitsa linear x-dependence, in line with ab initio predictions. Complexity arises atthe bond scale, referring to the intricate Cd1-xZnxTe percolation-type Ramanpattern [T. Alhaddad et al., Journal of Applied Physics 133, 065701 (2023)].This offers an appealing benchmark to test various phonon coupling processes atdiverse length scales in a compact multi-oscillator assembly, presently tunedby pressure. At x around 0, an inter-bond long-range/macro electric couplingbetween the matrix and impurity polar phonons is detuned under pressure.Inversely, at x around 1, an intra-bond short-range/nano mechanic coupling isenforced between the two Zn Te apolar sub-phonons stemming from same and alienpercolation-type environments. The pressure-induced macro/nano polar/apolarcoupling/decoupling processes are compared within a model of two coupledelectric/mechanic harmonic oscillators in terms of a compromise betweenproximity to resonance and strength of coupling, impacting the degree of modemixing, with ab initio (apolar case) and analytical (polar case) Ramancalculations in support. Notably, the free mechanic coupling at x around 1opposes the achievement of a phonon exceptional point, manifesting theinhibition of mechanic coupling, earlier evidenced with similar bonds for xsmaller than 0.5. Hence, the pressure dependence of a given bond vibration in adisordered alloy basically differs depending on whether the bond ismatrix-like, i.e., self-connected in bulk (free coupling), or dispersed, i.e.,self-connected in a chain (inhibited coupling). This features pressure-tunablepercolation-based on-off phonon switches in complex media.

Multiscale insight into the Cd1-xZnxTe vibrational-mechanical properties -- High-pressure experiments and ab initio calculations