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

TL;DR

This study investigates polarization-dependent photoluminescence-excitation spectra of T-shaped quantum wires at low temperature, identifying exciton and continuum states, and confirming findings with theoretical calculations.

Contribution

It provides detailed experimental spectra and correlates them with a theoretical model for exciton states in T-shaped quantum wires, highlighting new insights into their polarization dependence.

Findings

Identification of 1D-exciton ground state peak

Observation of continuum states with similar polarization dependence

Detection of excited hole subband exciton states

Abstract

We measured polarization-dependent photoluminescence-excitation spectra of highly uniform T-shaped quantum wires at 5 K. We attribute one peak to the 1D-exciton ground state and the continuous absorption band to 1D continuum states. These had similar polarization-dependences. We also observed some other peaks above the 1D-exciton ground state and attribute them to exciton states consisting of excited hole subbands. These results show good agreement with a model calculation of a single electron-hole pair in T-shaped geometry with exact diagonalizations of the Coulomb interaction.