Journal
PHYSICAL REVIEW LETTERS
Volume 91, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.91.056603
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We study the quantum nonlinear response to an applied electric field E of a one-dimensional pinned charge-density wave or Luttinger liquid in the presence of disorder. From an explicit construction of low-lying metastable states and of bounce instanton solutions between them, we demonstrate quantum creep v=e(-c/E1/2) as well as a sharp crossover at E=E-* towards a linear response form consistent with variable-range hopping arguments, but dependent only on electronic degrees of freedom.
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