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Spin-Charge Separation and Localization in One Dimension

2005; American Association for the Advancement of Science; Volume: 308; Issue: 5718 Linguagem: Inglês

10.1126/science.1107821

1095-9203

Ophir M. Auslaender, Hadar Steinberg, Amir Yacoby, Yaroslav Tserkovnyak, B. I. Halperin, K. W. Baldwin, L. N. Pfeiffer, K. W. West,

Semiconductor Quantum Structures and Devices

We report on measurements of quantum many-body modes in ballistic wires and their dependence on Coulomb interactions, obtained by tunneling between two parallel wires in an GaAs/AlGaAs heterostructure while varying electron density. We observed two spin modes and one charge mode of the coupled wires and mapped the dispersion velocities of the modes down to a critical density, at which spontaneous localization was observed. Theoretical calculations of the charge velocity agree well with the data, although they also predict an additional charge mode that was not observed. The measured spin velocity was smaller than theoretically predicted.