scholarly journals Quasiparticle Lifetimes and the Conductivity Scattering Rate

1997 ◽  
Vol 50 (6) ◽  
pp. 1011 ◽  
Author(s):  
F. Marsiglio ◽  
J. P. Carbotte
Keyword(s):  
Fermi Surface ◽  
Single Particle ◽  
Superconducting State ◽  
Qualitative Agreement ◽  
Impurity Scattering ◽  
Quantitative Agreement ◽  
Metallic System ◽  
S Wave ◽  
Scattering Rate ◽  
Quasiparticle Lifetime

We compute the single-particle inverse lifetime, along with the conductivity-derived scattering rate, for a metallic system in an s-wave superconducting state. When both electron–phonon and electron-impurity scattering are included, we find that while these scattering rates are in qualitative agreement, in general quantitative agreement is lacking. We also derive results for the quasiparticle lifetime within the BCS framework with impurity scattering, which makes it clear that impurity scattering is suppressed for electrons near the Fermi surface in the superconducting state.

scholarly journals Electronic Properties of Quasi-One-Dimensional Semiconductor Nanostructures: Plasmons and Exchange-Correlation Effects in Quantum Wires

1993 ◽  
Vol 46 (3) ◽  
pp. 359
Author(s):  
S Das Sarma ◽  
Ben Yu-Kuang Hu
Keyword(s):  
Fermi Surface ◽  
Finite Temperature ◽  
Quantum Wire ◽  
Impurity Scattering ◽  
Low Energy ◽  
One Dimensional ◽  
Exchange Correlation ◽  
Self Energy ◽  
Scattering Rate ◽  
Emission Threshold

We review the many-body exchange-correlation properties of electrons confined to the lowest sub-band of a quantum wire, including effects of impurity scattering. Without impurity scattering, the virtual excitations of arbitrarily low energy one-dimensional plasmons destroy the Fermi surface of the electrons, whereas the presence of impurity scattering damps out the low energy plasmons and restores the Fermi surface. The electron inelastic scattering rate r in the absence of scattering is zero below a critical wavevector kc corresponding to the plasmon emission threshold, above which r diverges as (k - kc )-1/2 for k -t kc. For typical wire widths and electron densities currently available, the calculated bandgap renormalisation is found to be on the order of 10-20 meV. We also calculate the finite-temperature inelastic scattering rates and mean free paths of electrons injected into a quantum wire containing a quasi-one-dimensional electron gas. We show that there is a very sharp increase in the electron scattering rate at the one-dimensional plasmon emission threshold. Based on these results, we suggest the possibility of a one-dimensional hot-electron device which possesses an I - V curve with a sharp onset of a large negative differential resistance. We also present a general method for obtaining expressions for the analytic continuation of finite-temperature self-energies which are suitable for use in numerical computations. In the case of the GW approximation for the self-energy, this method gives the finite-temperature generalisation of the zero-temperature 'line and pole' decomposition. This formalism is used to calculate the finite-temperature self-energy and bandgap renormalisation of electrons in the extreme quantum limit of a quantum wire. A brief review of the experimental and theoretical status of plasmons in quantum wire structures is given.

scholarly journals Two-Fermi-Surface Superconducting State and a Nodald-Wave Energy Gap of the Electron-DopedSm1.85Ce0.15CuO4−δCuprate Superconductor

2011 ◽  
Vol 106 (19) ◽  
Author(s):  
A. F. Santander-Syro ◽  
M. Ikeda ◽  
T. Yoshida ◽  
A. Fujimori ◽  
K. Ishizaka ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Wave Energy ◽  
Superconducting State ◽  
Energy Gap

scholarly journals Effect of Born and unitary impurity scattering on the Kramer–Pesch shrinkage of a vortex core in an s-wave superconductor

2013 ◽  
Vol 484 ◽  
pp. 69-73 ◽  
Author(s):  
Nobuhiko Hayashi ◽  
Yoichi Higashi ◽  
Noriyuki Nakai ◽  
Hisataka Suematsu
Keyword(s):  
Vortex Core ◽  
Impurity Scattering ◽  
S Wave

scholarly journals Structure of the Super Neutronised Doubly Closed Shell Nucleus 132Sn

1992 ◽  
Vol 45 (1) ◽  
pp. 39 ◽  
Author(s):  
Rupayan Bhattacharya
Keyword(s):  
Fermi Surface ◽  
Charge Distribution ◽  
Excellent Agreement ◽  
Single Particle ◽  
Ground State ◽  
Closed Shell ◽  
Mass Region ◽  
Body Potential ◽  
State Charge ◽  
Closed Shell Nucleus

The scenario of single particle (proton as well as neutron) states near the Fermi surface of 132Sn has been investigated on the basis of an average one-body potential suitably optimised for 208Pb and then extrapolated to the mass region concerned. The calculation shows excellent agreement with experiment. The ground state charge distribution of the nucleus has also been calculated.

scholarly journals Normal and superconducting state in the presence of forward electron-phonon and impurity scattering

1999 ◽  
Vol 9 (2) ◽  
pp. 201-206 ◽  
Author(s):  
O.V. Danylenko ◽  
O.V. Dolgov ◽  
M.L. Kulic ◽  
V. Oudovenko
Keyword(s):  
Superconducting State ◽  
Impurity Scattering

The Prediction of Wear in Fluidized Beds

1995 ◽  
Vol 117 (2) ◽  
pp. 142-149 ◽  
Author(s):  
W. A. Rogers
Keyword(s):  
Fluidized Bed ◽  
Single Particle ◽  
Fluidized Beds ◽  
Tube Bundle ◽  
Optimization Procedure ◽  
Quantitative Agreement ◽  
Particle Collisions ◽  
Wear Model ◽  
Wear Rates ◽  
Fluidized Particles

A procedure is formulated to model impact and abrasion wear of surfaces exposed to a fluidized bed. A methodology adapting a single-particle wear model and the kinetic theory of gases to granular flows is used to develop a model accounting for impact wear from all possible particle collisions. Abrasive wear is modeled using a single-particle abrasion model adapted to describe the effects of many abrading particles. Parameters describing granular flow are necessary for evaluation of the resulting wear expressions. They are determined by numerical solution of the conservation equations describing fluidized-bed hydrodynamics. Additional parameters appear in the wear expressions which describe the contact between individual fluidized particles and the wearing surface. These are determined by an optimization procedure which minimizes error between predicted and measured wear rates. The modeling procedure was used to analyze several bubbling and turbulent fluidized bed experiments with single-tube and tube bundle configurations. Quantitative agreement between the measured and predicted wear rates was found, with some exceptions for local wear predictions. This work demonstrates a methodology for wear predication in fluidized beds.

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