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Tunneling spectroscopy of quantum wires: Spin‐charge separation and localization
Author(s) -
Yacoby A.,
Auslaender O. M.,
Steinberg H.,
Tserkovnyak Y.,
Halperin B. I.,
Baldwin K. W.,
Pfeiffer L. N.,
West K. W.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642223
Subject(s) - condensed matter physics , quantum tunnelling , charge (physics) , spectroscopy , spin (aerodynamics) , coulomb , physics , quantum wire , charge density , scanning tunneling spectroscopy , dispersion (optics) , quantum , molecular physics , chemistry , atomic physics , quantum mechanics , electron , thermodynamics
Using a double wire geometry we probe the quantum many‐body modes in ballistic wires and their dependence on Coulomb interactions. The wires are fabricated using the cleaved edge overgrowth method. We clearly observe two spin modes and one charge mode of the coupled wires. We 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. Surprisingly, the suppression of the spin velocities does not depend on density. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)