... volume fractions and superlattice periods. Details of the nonequilibrium energy exchange between optical and acoustic phonons that originate from the mismatch of phonon spectra in silicon and germanium are delineated for the first time. Conditions are identified for which this effect can produce...

... value of unity. In heterogeneous bulk materials, the transmission function is reduced significantly due to the junction of dissimilar materials. eigenvalues and eigenfunctions elemental semiconductors germanium Green's function methods phonons silicon phonon Green’s function polarization...

... germanium heat transfer interface phenomena molecular dynamics method phonons silicon thermal conductivity thermal boundary conductance phonon classical limit silicon germanium diffuse mismatch model molecular dynamics The phonon thermal boundary conductance between two solids...

... c is acoustic impedance, ρ is mass density, and c is speed of sound, respectively. This formula gives a transmissivity value of 0.95 based on the mass difference of silicon and germanium. This estimation matches the MD prediction well. As the frequency increases, the phonon...

...-assembly is an emerging epitaxial technology to design ultradense arrays of germanium QDs in silicon for many promising electronic and photonic applications such as quantum computing, where accurate QD positioning is required. We theoretically demonstrate that high-density three-dimensional (3D) arrays...

...) ( 17 ) is used to visualize the structure of systems. In the thermal energy transport simulation, different systems were studied. The simulated systems contain 64 atoms. In terms of material, silicon-silicon (Si–Si) with a lattice constant of 5.431   Å , germanium-germanium (Ge–Ge...

... that the inclusion of scattering effects reduces the electrical conductivity leading to a significant reduction in the power factor ( S 2 σ ). silicon germanium elemental semiconductors semiconductor thin films Seebeck effect Green's function methods electron-phonon interactions semiconductor...

...W. Zhang; T. S. Fisher; N. Mingo An atomistic Green’s function method is developed to simulate phonon transport across a strained germanium (or silicon) thin film between two semi-infinite silicon (or germanium) contacts. A plane-wave formulation is employed to handle the translational symmetry...

...J. D. Chung, Assistant Professor; A. J. H. McGaughey, Graduate Student; M. Kaviany, Professor, ASME Fellow The role of phonon dispersion in the prediction of the thermal conductivity of germanium between temperatures of 2 K and 1000 K is investigated using the Holland approach. If no dispersion...