Abstract
Evidence for charge fluctuations in diagonal stripes coupled with electrons at the Fermi surface is reported. Superconducting Bi 2Sr 2CaCu 2O 8+δ at optimum doping ( T c=91 K) has been studied by angle-scanning photoemission spectroscopy using synchrotron radiation. The Fermi surface shows broken segments and hot spots of high spectral weight. The suppression of spectral weight in the pseudogap region near M=(π,0) is shown to be due to a charge modulation with wavevector q 1≈0.4(π,π) associated with the superlattice of one-dimensional (1D) diagonal stripes or 1D charge-density waves. These stripes coexist with collective spin and charge fluctuations in the vertical direction.
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