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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


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 moiré patterns reflecting different spin and charge excitation velocities.

Original languageAmerican English
Pages (from-to)657-663
Number of pages7
JournalSolid State Communications
Issue number9-10 SPEC. ISS.
StatePublished - Sep 2004
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported in part by the US-Israel BSF, the European Commission RTN Network Contract No. HPRN-CT-2000-00125 and NSF Grant DMR 02-33773. YT is supported by the Harvard Society of Fellows.


  • A. Nanostructures
  • D. Electron-electron interactions
  • D. Electronic transport
  • D. Tunnelling


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