Author:
Choksy D.J.,Szwed E.A.,Butov L.V.,Baldwin K.W.,Pfeiffer L.N.
Abstract
We observed a strong enhancement of spatially direct absorption at the Fermi energy of ultracold electron-hole system in separated electron and hole layers, evidencing Fermi-energy excitons. Absorption was probed by photoluminescence excitation spectroscopy.