Spin-charge separation and localization in one-dimension

Details Spin-charge separation and localization in one-dimension Spin-charge separation and localization in one-dimension

2005-07-03

arxiv.org/abs/cond-mat/0507065v1

Science 308, 88-92 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

There are minor textual differences between this version and the version that has been published in Science (follow the DOI li

Scientific paper

10.1126/science.1107821

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.

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