Probing SpinCharge Separation in a TomonagaLuttinger Liquid
Abstract
In a onedimensional (1D) system of interacting electrons, excitations of spin and charge travel at different speeds, according to the theory of a TomonagaLuttinger liquid (TLL) at low energies. However, the clear observation of this spincharge separation is an ongoing challenge experimentally. We have fabricated an electrostatically gated 1D system in which we observe spincharge separation and also the predicted powerlaw suppression of tunneling into the 1D system. The spincharge separation persists even beyond the lowenergy regime where the TLL approximation should hold. TLL effects should therefore also be important in similar, but shorter, electrostatically gated wires, where interaction effects are being studied extensively worldwide.
 Publication:

Science
 Pub Date:
 July 2009
 DOI:
 10.1126/science.1171769
 arXiv:
 arXiv:1002.2782
 Bibcode:
 2009Sci...325..597J
 Keywords:

 PHYSICS;
 Condensed Matter  Strongly Correlated Electrons;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 11 pages, 4 PDF figures, uses scicite.sty, Science.bst