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While soft quasilocalized vibrational modes are known to populate thelow-frequency spectrum of glassy solids, their contribution to thermalproperties is still not fully elucidated. We numerically show that, despitetheir spatially localized nature, these modes are as effective heat carriers asthe delocalized ones and can contribute non-negligible to the total thermalconductivity in the low-temperature regime, especially for T < 0.05 Tg where Tgis the glass transition temperature. We further prove that the mutual coherencebetween the low-frequency quasilocalized modes and other modes explains thishigh thermal exchange performance. Our finding finally provides a perspectiveon the thermal transport behaviour of the low-frequency quasilocalized modes inglassy solids.

Quasilocalized Vibrational Modes as Efficient Heat Carriers in Glasses