20.500.12556/DiRROS-29388 Phonon frequency comb close to an isolated Einstein mode in ▫$InSiTe_3$▫ The emergence of phonon frequency combs exemplifies a rare and intriguing phenomenon in quantum solids. Materials with distinctive phonon band structures are especially promising for hosting such states, as their vibrational dispersion landscape across the Brillouin zone can facilitate the formation of long-lived, collective lattice excitations. In the layered Van der Waals compound InSiTe3, polarization-resolved Raman spectroscopy reveals a pronounced anharmonicity in symmetry-predicted modes and the formation of a self-organized frequency domain structure (coherent-like state), in the range of a localized high-energy A1g phonon mode near 500 cm−1. This strong phonon-phonon coupling manifests itself as an anomalous temperature dependence around 200 K, coinciding with the appearance of higher-order excitations within the phonon density of states gap. These findings position InSiTe3 as an unconventional platform where intrinsic highly structured phonon spectral correlations and unusually strong anharmonic effects coexist, opening new avenues for exploring emergent vibrational phenomena in low-dimensional materials. phonon phonon frequency comb Layered Van der Waals materials femtosecond excitation fonon kvantni materiali true false true Nature Publishing Group Združeno kraljestvo Angleški jezik Slovenski jezik © The Author(s) 2026 Neznano 2026-05-14 13:35:10 2026-05-14 13:35:10 2026-05-15 03:47:50 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 14. 5. 2026; str. 1-11 Vol. 16, article no. 13944 17 Mar. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-12-02 2026-03-10 2026-05-01 53 2045-2322 10.1038/s41598-026-44212-1 278107907 https://www.nature.com/articles/s41598-026-44212-1 1 f9d7c9a9-4f88-11f1-8a5a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=44035 RAZ_Belojica_Tea_2026.pdf RAZ_Belojica_Tea_2026.pdf 1 9A26578C71E580930AA8B70E381022EC ebfa7ceaeba18e0499b86dabd13ad41ae934508bae2a2184137bddda4960ad7b 706cfec4-4f89-11f1-8a5a-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=44036 Institut Jožef Stefan 0 0 0