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. 2009 Jul 31;325(5940):597-601.
doi: 10.1126/science.1171769.

Probing spin-charge separation in a Tomonaga-Luttinger liquid

Y Jompol  1 , C J B Ford, J P Griffiths, I Farrer, G A C Jones, D Anderson, D A Ritchie, T W Silk, A J Schofield
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Probing spin-charge separation in a Tomonaga-Luttinger liquid

Y Jompol et al. Science. .
Free article

Abstract

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.

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