Probing spincharge separation in tunnelcoupled parallel quantum wires
Abstract
Interactions in onedimensional (1D) electron systems are expected to cause a dynamical separation of electronic spin and charge degrees of freedom. A promising system for experimental observation of this nonFermiliquid effect consists of two quantum wires coupled via tunneling through an extended uniform barrier. Here we consider the minimal model of an interacting 1D electron system exhibiting spincharge separation, and calculate the differential tunneling conductance as well as the densitydensity response function. Both quantities exhibit distinct strong features arising from spincharge separation. Our analysis of these features within the minimal model neglects interactions between electrons of opposite chirality, and therefore applies directly to chiral 1D electron systems realized, e.g., at the edge of integer quantum Hall systems. Physical insight gained from our results is useful for interpreting current experiment in quantum wires, as our main conclusions still apply with nonchiral interactions present. In particular, we discuss the effect of charging due to applied voltages, and the possibility to observe spincharge separation in a timeresolved experiment.
 Publication:

Physical Review B
 Pub Date:
 May 2002
 DOI:
 10.1103/PhysRevB.65.205304
 arXiv:
 arXiv:condmat/0105066
 Bibcode:
 2002PhRvB..65t5304Z
 Keywords:

 73.63.Nm;
 71.10.Pm;
 73.40.Gk;
 Quantum wires;
 Fermions in reduced dimensions;
 Tunneling;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 9 pages, 3 figures, expanded version with many details