Dynamics of lattice pinned charge stripes

Abstract

We study the transversal dynamics of a charged stripe (quantum string) and show that zero temperature quantum fluctuations are able to depin it from the lattice. If the hopping amplitude t is much smaller than the string tension J, the string is pinned by the underlying lattice. At t>>J, the string is depinned and allowed to move freely, if we neglect the effect of impurities. By mapping the system onto a 1D array of Josephson junctions, we show that the quantum depinning occurs at t/J = 2 / pi^2. Besides, we exploit the relation of the stripe Hamiltonian to the sine-Gordon theory and calculate the infrared excitation spectrum of the quantum string for arbitrary t/J values.

4 pages, 2 figures

References in corpus (5)

• Incommensurate Magnetic Fluctuations in YBa2Cu3O6.6
• Neutron diffraction study of stripe order in La(2)NiO(4+d) with d=2/15
• Charged domain walls as quantum strings living on a lattice
• Superconductivity, Josephson coupling and order parameter symmetry in striped cuprates
• Dynamics of Stripes in Doped Antiferromagnets

Cited by in corpus (5)

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• Interplay between Freezing and Superconductivity in the Optimally Doped LaEu0.20Sr0.15CuO4 under Hydrostatic Pressure
• Electronic transport through correlated electron systems with nonhomogeneous charge orderings
• The gas of elastic quantum strings in 2+1 dimensions: finite temperatures
• Optical response for a discrete stripe