Direct observation of phonon Anderson localization in Si/Ge aperiodic superlattices
Renjiu Hu, Zhiting Tian
Abstract
Phonon Anderson localization has been receiving increasing interest in creating unique thermal transport properties. However, due to challenges to resolve and track the mode-specific transmission, the existence of phonon Anderson localization has only been inferred from the decay of overall thermal conductivity versus device length. In this work, we present direct evidence of phonon Anderson localization using the exponential decay of their mode-resolved transmissions. We clearly capture localized modes in different structures, even with a monotonically upward thermal conductivity trend.
Topics & Concepts
PhononAnderson localizationThermal conductivityCondensed matter physicsSuperlatticeAperiodic graphPhysicsExponential decayWork (physics)ThermalExponential functionTransmission (telecommunications)Materials scienceQuantum mechanicsComputer scienceThermodynamicsMathematicsTelecommunicationsCombinatoricsMathematical analysisThermal properties of materialsForce Microscopy Techniques and ApplicationsAdhesion, Friction, and Surface Interactions