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Many-body dispersions in interacting ballistic quantum wires

Ophir M. Auslaender·Hadar Steinberg·Amir Yacoby·Yaroslav Tserkovnyak·Bertrand I. Halperin·Rafael de Picciotto·Kirk W. Baldwin·Loren N. Pfeiffer·Ken W. West
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Abstract

We have measured the collective excitation spectrum of interacting electrons in one-dimension. The experiment consists of controlling the energy and momentum of electrons tunneling between two clean and closely situated, parallel quantum wires in a GaAs/AlGaAs heterostructure while measuring the resulting conductance. We measure excitation spectra that clearly deviate from the non-interacting spectrum, attesting to the importance of Coulomb interactions. Notable is an observed 30% enhancement of the velocity of the main excitation branch relative to non-interacting electrons with the same density. In short wires, finite size effects resulting from broken translational invariance are observed. Spin - charge separation is manifested through moire patterns, reflecting different spin and charge excitation velocities.

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Ophir M. Auslaender, Hadar Steinberg, Amir Yacoby, Yaroslav Tserkovnyak, Bertrand I. Halperin, Rafael de Picciotto, Kirk W. Baldwin, Loren N. Pfeiffer, Ken W. West. 2004-05-16. Many-body dispersions in interacting ballistic quantum wires. https://doi.org/10.1016/j.ssc.2004.05.024

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