Tunneling exponents sensitive to impurity scattering in quantum wires

Details Tunneling exponents sensitive to impurity scattering in quantum wires Tunneling exponents sensitive to impurity scattering in quantum wires

2007-03-01

arxiv.org/abs/cond-mat/0703034v2

Phys. Rev. Lett. 99, 076801 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures; slightly extended version of the published article

Scientific paper

We show that the scaling exponent for tunneling into a quantum wire in the "Coulomb Tonks gas" regime of impenetrable, but otherwise free, electrons is affected by impurity scattering in the wire. The exponent for tunneling into such a wire thus depends on the conductance through the wire. This striking effect originates from a many-body scattering resonance reminiscent of the Kondo effect. The predicted anomalous scaling is stable against weak perturbations of the ideal Tonks gas limit at sufficiently high energies, similar to the phenomenology of a quantum critical point.

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