The Role of Nonequilibrium Dynamical Screening in Carrier Thermalization

Physics – Condensed Matter

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Revised version with additional refs. 12 pages, figs. available upon request; Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.55.1517

We investigate the role played by nonequilibrium dynamical screening in the thermalization of carriers in a simplified two-component two-band model of a semiconductor. The main feature of our approach is the theoretically sound treatment of collisions. We abandon Fermi's Golden rule in favor of a nonequilibrium field theoretic formalism as the former is applicable only in the long-time regime. We also introduce the concept of nonequilibrium dynamical screening. The dephasing of excitonic quantum beats as a result of carrier-carrier scattering is brought out. At low densities it is found that the dephasing times due to carrier-carrier scattering is in picoseconds and not femtoseconds, in agreement with experiments. The polarization dephasing rates are computed as a function of the excited carrier density and it is found that the dephasing rate for carrier-carrier scattering is proportional to the carrier density at ultralow densities. The scaling relation is sublinear at higher densities, which enables a comparison with experiment.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

The Role of Nonequilibrium Dynamical Screening in Carrier Thermalization does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Role of Nonequilibrium Dynamical Screening in Carrier Thermalization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Role of Nonequilibrium Dynamical Screening in Carrier Thermalization will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-253536

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.