Polarization-dependent photoluminescence-excitation spectra of one-dimensional exciton and continuum states in T-shaped quantum wires

摘要

We measured polarization-dependent photoluminescence-excitation spectra ofhighly uniform T-shaped quantum wires at 5 K. We attribute one peak to the1D-exciton ground state and the continuous absorption band to 1D continuumstates. These had similar polarization-dependences. We also observed some otherpeaks above the 1D-exciton ground state and attribute them to exciton statesconsisting of excited hole subbands. These results show good agreement with amodel calculation of a single electron-hole pair in T-shaped geometry withexact diagonalizations of the Coulomb interaction.