Showing papers by "David Broido published in 1997"
TL;DR: In this article, a full theory of thermoelectric transport in superlattices, including the well width and energy dependence of the optical and acoustic phonon scattering and the effects of confinement in raising valley degeneracy is developed.
Abstract: A full theory of thermoelectric transport in superlattices, including the well width and energy dependence of the optical and acoustic phonon scattering and the effects of confinement in raising valley degeneracy is developed It is shown that these features result in qualitatively significant modifications in the predicted figure of merit of superlattice systems Results are given for PbTe superlattices, and comments are made on recent experimental results for such systems
74 citations
01 Mar 1997
TL;DR: It is found that the electrons become fully polarized as T → 0 and that the loss of spin polarization over the temperature regime of 500mK to 12K is consistent with a recently proposed continuum quantum ferromagnet model of the spin thermodynamics of the ν = 1 QHE state.
Abstract: The absolute spin polarization of a two-dimensional electron gas has been measured as a function of temperature at the ν = 1 quantum Hall state by magnetoabsorption spectroscopy. We find that the electrons become fully polarized as T → 0 and that the loss of spin polarization over the temperature regime of 500mK to 12K is consistent with a recently proposed continuum quantum ferromagnet model of the spin thermodynamics of the ν = 1 QHE state.
25 citations
TL;DR: In this paper, a quantitative description of the power factor for thermoelectric transport in quantum well and quantum wire superlattices has been developed, and the size dependence of the carrier scattering rates as well as carrier tunneling between layers are included.
Abstract: A quantitative description of the power factor for thermoelectric transport in quantum well and quantum wire superlattices has been developed. The size dependence of the carrier scattering rates as well as carrier tunneling between layers are included, and results are obtained for full three-dimensional superlattice systems. In addition, model calculations of the lattice thermal conductivity of free standing wells and wires have been obtained, and their implications for the thermoelectric figure of merit are discussed. Illustrative results are given for GaAs and PbTe systems.
5 citations
26 Aug 1997
TL;DR: In this article, the authors discuss the thermoelectric transport coefficients and the figure of merit of realistic quantum well and quantum wire superlattice systems, and the electronic contribution to the transport is described in detail by including the effects of the heat current along the barriers, of carrier tunneling through the barriers and of well width dependence of the scattering rates.
Abstract: We discuss the thermoelectric transport coefficients and the figure of merit of realistic quantum well and quantum wire superlattice systems. The electronic contribution to the transport is described in detail by including the effects of the heat current along the barriers, of carrier tunneling through the barriers, of well width dependence of the scattering rates, and of lifting of the valley degeneracy in realistic superlattice systems. The lattice thermal conductivity is described by including the effects of interface scattering.
5 citations
TL;DR: In this article, the authors provide an explanation of the recently observed electrostatically enforced structural phase transition (3 × 1 to 6 × 1) on a Si(111) surface with submonolayer Ag adsorption.
Abstract: Electron correlations are strongly enhanced in low-dimensional systems. Taking correlations as the dominant mechanism, we provide an explanation of the recently observed electrostatically enforced structural phase transition (3 × 1 to 6 × 1) on a Si(111) surface with submonolayer Ag adsorption.
4 citations
01 Mar 1997
TL;DR: In this paper, a quantitative description of the power factor for thermoelectric transport in quantum well and quantum wire superlattices has been developed, and the size dependence of the carrier scattering rates as well as carrier tunneling between layers are included.
Abstract: A quantitative description of the power factor for thermoelectric transport in quantum well and quantum wire superlattices has been developed. The size dependence of the carrier scattering rates as well as carrier tunneling between layers are included, and results are obtained for full three-dimensional superlattice systems. In addition, model calculations of the lattice thermal conductivity of free standing wells and wires have been obtained, and their implications for the thermoelectric figure of merit are discussed. Illustrative results are given for GaAs and PbTe systems.