OPTICAL-EMISSION OF A ONE-DIMENSIONAL ELECTRON-GAS IN SEMICONDUCTOR V-SHAPED QUANTUM WIRES

The optical emission spectrum of a one-dimensional electron gas has be en studied in modulation-doped GaAs quantum wires grown by molecular-b eam epitaxy on V-grooved substrates. At low temperatures the spectra a re dominated by a strong Fermi-edge singularity, as in previously repo rted results for ion-milled quantum wires. The emission spectral shape and its temperature dependence are identical for both sets of wires, revealing a kind of universal behavior. Comparison with calculations b ased on the Fermi-liquid model indicate a significant coupling between the electron system and empty conduction subbands. [S0163-1829(98)036 39-X].