Friday, January 18, 2013

1301.4119 (Maarten Baeten et al.)

Fermi edge polaritons in a highly degenerate 2D electron gas: a
diagrammatic theory
   [PDF]

Maarten Baeten, Michiel Wouters
We present a theoretical study on polaritons in highly doped semiconductor microcavities. In particular, we focus on a cavity mode that is resonant with the absorption threshold (`Fermi edge'). In agreement with experimental results, the strong light-matter coupling is maintained under very high doping within our ladder diagram approximation. While the lower polariton is qualitatively unaltered, it acquires a finite lifetime due to relaxation of the valence band hole if the electron density exceeds a certain critical value. On the other hand the upper polariton has a finite lifetime for all densities, because it lies in the electron-hole continuum where no bound state exists. Our calculations show that a narrow upper polariton quasiparticle still exists as a result from the interplay between light-matter coupling and final state Coulomb interaction.
View original: http://arxiv.org/abs/1301.4119

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