Nonlinear spectra of spinons and holons in short GaAs quantum wires
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Moreno, M., Ford, C., Jin, Y., Griffiths, J., Farrer, I., Jones, G., Ritchie, D., et al. (2016). Nonlinear spectra of spinons and holons in short GaAs quantum wires. Nature Communications, 7 (12784)https://doi.org/10.1038/ncomms12784
One-dimensional electronic fluids are peculiar conducting systems, where the fundamental role of interactions leads to exotic, emergent phenomena, such as spin-charge (spinon-holon) separation. The distinct low-energy properties of these 1D metals are successfully described within the theory of linear Luttinger liquids, but the challenging task of describing their high-energy nonlinear properties has long remained elusive. Recently, novel theoretical approaches accounting for nonlinearity have been developed, yet the rich phenomenology that they predict remains barely explored experimentally. Here, we probe the nonlinear spectral characteristics of short GaAs quantum wires by tunnelling spectroscopy, using an advanced device consisting of 6000 wires. We find evidence for the existence of an inverted (spinon) shadow band in the main region of the particle sector, one of the central predictions of the new nonlinear theories. A (holon) band with reduced effective mass is clearly visible in the particle sector at high energies.
This work was supported by the UK EPSRC [Grant Nos. EP/J01690X/1 and EP/J016888/1].
UNIVERSITY COLLEGE LONDON (FB EPSRC) (EP/K004077/1)
External DOI: https://doi.org/10.1038/ncomms12784
This record's URL: https://www.repository.cam.ac.uk/handle/1810/260161
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International
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