Incommensurate, dispersive, density of states modulations in Bi2Sr2CaCu2O<f>8+δ</f>

Scanning tunneling spectroscopy of Bi2Sr2CaCu2O<f>8+δ</f> reveals weak, incommensurate, spatial modulations in the tunneling conductance. When images of these energy-dependent modulations are Fourier analyzed the dispersion of their wave vectors can be determined. Comparison of the dispersions with angle-resolved photoemission indicates that quasiparticle interference, due to elastic scattering between specific regions of the Fermi surface, provides a consistent explanation for the conductance modulations. [Copyright &y& Elsevier]