We report on measurements of quantum many-body modes in ballistic wires and their dependence on Coulomb interactions, obtained from tunneling between two parallel wires in a GaAs/AlGaAs heterostructure while varying electron density. We observe two spin modes and one charge mode of the coupled wires, and map the dispersion velocities of the modes down to a critical density, at which spontaneous localization is observed. Theoretical calculations of the charge velocity agree well with the data, although they also predict an additional charge mode that is not observed. The measured spin velocity is found to be smaller than theoretically predicted.
@article{arxiv.cond-mat/0507065,
title = {Spin-charge separation and localization in one-dimension},
author = {O. M. Auslaender and H. Steinberg and A. Yacoby and Y. Tserkovnyak and B. I. Halperin and K. W. Baldwin and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:cond-mat/0507065},
year = {2007}
}
Comments
There are minor textual differences between this version and the version that has been published in Science (follow the DOI link below to obtain it). In addition, here we have had to reduce figure quality to save space on the server