Effect of phonon scattering by surface roughness on the universal thermal conductance.

Effect of surface roughness on the universal thermal conductance

We explain the reduction of the thermal conductance below the predicted universal value observed by Schwab et al. @Nature ~London! 404, 974 ~2000!# in terms of the scattering of thermal phonons off surface roughness using a scalar model for the elastic waves. Our analysis shows that the thermal conductance depends on two roughness parameters: the roughness amplitude d and the correlation length...

The Effect of Surface Roughness on the Universal Thermal Conductance

We explain the reduction of the thermal conductance below the predicted universal value observed by Schwab et al.1 in terms of the scattering of thermal phonons off surface roughness using a scalar model for the elastic waves. Our analysis shows that the thermal conductance depends on two roughness parameters: the roughness amplitude δ and the correlation length a. At sufficiently low temperatu...

Surface scattering analysis of phonon transport in the quantum limit using an elastic model

We have investigated the effect on phonon energy transport in mesoscopic systems and the reduction in the thermal conductance in the quantum limit due to phonon scattering by surface roughness, using full threedimensional elasticity theory for an elastic beam with a rectangular cross section. At low frequencies, we find power laws for the scattering coefficients that are strongly mode dependent...

Effect of Surface Roughness on Phonon Thermal Conductance in the Quantum Limit

Quantum transport and dynamics of phonons in mesoscopic systems

Recent advances in nanotechnology have shrunk the size of mesoscopic structures. This allows us to investigate the quantum mechanics of mechanical oscillators. In this thesis we focus on two aspects. In Part I, an individual discrete mode structure of an oscillator and its effect to thermal conductance have been thoroughly examined: Specifically, we investigated the reduction in the thermal con...