Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-30
Phys. Rev. B 67, 094514 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 9 figs; (v2) minor corrections to formalism, discussions of dispersion, structure factors and sum rules added; (v3)
Scientific paper
10.1103/PhysRevB.67.094514
Motivated by the recent STM experiments of J.E. Hoffman et.al. and C. Howald et.al., we study the effects of weak translational symmetry breaking on the quasiparticle spectrum of a d-wave superconductor. We develop a general formalism to discuss periodic charge order, as well as quasiparticle scattering off localized defects. We argue that the STM experiments in $Bi_2Sr_2CaCu_2O_{8+\delta}$ cannot be explained using a simple charge density wave order parameter, but are consistent with the presence of a periodic modulation in the electron hopping or pairing amplitude. We review the effects of randomness and pinning of the charge order and compare it to the impurity scattering of quasiparticles. We also discuss implications of weak translational symmetry breaking for ARPES experiments.
Damle Kedar
Demler Eugene
Halperin Bertrand I.
Podolsky Daniel
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