Probing spin-charge separation in a Tomonaga-Luttinger liquid

Details Probing spin-charge separation in a Tomonaga-Luttinger liquid Probing spin-charge separation in a Tomonaga-Luttinger liquid

2010-02-14

arxiv.org/abs/1002.2782v1

Science 325 (2009) 597-601

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 4 PDF figures, uses scicite.sty, Science.bst

Scientific paper

10.1126/science.1171769

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 tunnelling 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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