Thermal Engineering in Low-Dimensional Quantum Devices: A Tutorial Review of Nonequilibrium Green's Function Methods

摘要: Thermal engineering of quantum devices has attracted much attention since the discovery quantized thermal conductance phonons. Although easily submerged in numerous excitations macro-systems, behaviors phonons manifest nanoscale low-dimensional systems even at room temperature. Especially nano transport devices, move quasi-ballistically when length is smaller than their bulk mean free paths. It been shown that phonon nonequilibrium Green's function method (NEGF) effective for investigation In this tutorial review two aspects are discussed using NEGF methods. One covers properties pure phonons; other concerns caloritronic effects, which manipulate degrees freedom, such as charge, spin, and valley, via temperature gradient. For each part, we outline basic theoretical formalisms first, then provide a survey on related investigations models or realistic materials. Particular given to topologies generalized method. Finally, conclude our summarize with an outlook.