On the topological features at the Fermi surface of Bi2212 system revealedby angle scanning photoemission

Here we report use of angle scanning photoemission spectroscopy using polar ized synchrotron light to explore the Fermi surface topology of Bi2Sr2CaCu2 O8+/-delta (Bi2212) superconductors. The measurements were made in differen t experimental geometry to take care of the polarization dependence of phot oemission transition probability (matrix element effect) and discriminate t he true features along the high symmetry directions. We find an asymmetric suppression of spectral weight around M(pi ,0) point indicating coupling of the itinerant carriers with an incommensurate charge density wave (ICDW) i .e. stripes, involving modulation of the orbital momentum.