Spin-charge separation and localization in one-dimension

Abstract

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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• Tomonaga-Luttinger parameters for quantum wires
• Mesoscopic effects in tunneling between parallel quantum wires
• Restricted and unrestricted Hartree-Fock calculations of conductance for a quantum point contact
• Momentum-resolved tunneling between Luttinger liquids
• Spin and Charge Luttinger-Liquid Parameters of the One-Dimensional Electron Gas
• Unusual conductance collapse in one-dimensional quantum structures

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