Probing Spin-Charge Separation in a Tomonaga-Luttinger Liquid

Research output: Contribution to journalArticlepeer-review


  • Y Jompol
  • CJB Ford
  • JP Griffiths
  • I Farrer
  • GAC Jones
  • D Anderson
  • DA Ritchie
  • Timothy Silk

Colleges, School and Institutes


In a one-dimensional (1D) system of interacting electrons, excitations of spin and charge travel at different speeds, according to the theory of a Tomonaga-Luttinger liquid (TLL) at low energies. However, the clear observation of this spin-charge separation is an ongoing challenge experimentally. We have fabricated an electrostatically gated 1D system in which we observe spin-charge separation and also the predicted power-law suppression of tunneling into the 1D system. The spin-charge separation persists even beyond the low-energy 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.


Original languageEnglish
Pages (from-to)597-601
Number of pages5
Issue number5940
Publication statusPublished - 1 Jul 2009