Threshold features in transport through a 1D constriction
Ponomarenko, Vadim · Nagaosa, Naoto
Original · EN
Suppression of electron current ΔI through a 1D channel of length L connecting two Fermi liquid reservoirs is studied taking into account the Umklapp electron-electron interaction induced by a periodic potential. This interaction causes Hubbard gaps Eₕ for L → ∞. In the perturbative regime where Eₕ ≪ vc/L (vc: charge velocity), and for small deviations δn of the electron density from its commensurate values - ΔI/V can diverge with some exponent as voltage or temperature V,T decreases above Ec=max(vc/L,vc δn), while it goes to zero below Ec. This results in a nonmonotonous behavior of the conductance.
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