The Fermi edge singularity of spin polarized electrons

Abstract

We study the absorption spectrum of a two-dimensional electron gas (2DEG) in a magnetic field. We find that that at low temperatures, when the 2DEG is spin polarized, the absorption spectra, which correspond to the creation of spin up or spin down electron, differ in magnitude, linewidth and filling factor dependence. We show that these differences can be explained as resulting from creation of a Mahan exciton in one case, and of a power law Fermi edge singularity in the other.

4 pages, 4 figures, published in Phys. Rev. Lett

References in corpus (3)

• The onset of exciton absorption in modulation doped GaAs quantum wells
• The absorption spectrum around nu=1: evidence for a small size Skyrmion
• Solution of the X-ray edge problem for 2D electrons in a magnetic field

Cited by in corpus (5)

• Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu =1$
• Spin-polarized lasing in a highly photoexcited semiconductor microcavity
• A Room-temperature Spin-polarized Polariton Laser
• Optically induced nuclear spin polarization in a single GaAs/AlGaAs quantum well probed by a resistance detection method in the fractional quantum Hall regime
• Magnetoexcitons and Massive Dirac Fermions in Monolayers of Transition Metal Dichalcogenides in a High Magnetic Field