Thursday, May 26, 2011, 1:30 pm — Small Seminar Room, Bldg. 510
Surface probes such as scanning tunneling microscopy (STM) have detected complex patterns at the nanoscale, ndicative of electronic inhomogeneity, in a variety of high temperature superconductors. In cuprates, the pattern formation is associated with the pseudogap phase, a precursor to the high temperature superconducting state.
Rotational symmetry breaking of the host crystal (i.e. from C4 to C2) in the form of electronic nematicity has recently been proposed as a unifying theme of the pseudogap phase; however the fundamental physics
governing the nanoscale pattern formation has not yet been identified.
Here we use universal cluster properties extracted from STM studies of cuprate superconductors in order to identify the fundamental physics controlling the complex pattern formation. We find that the pattern formation is set by a delicate balance between disorder, interactions,
and material anisotropy, leading to a fractal nature of the cluster pattern. The method we introduce may be extended to a variety of surface probes, enabling the direct measurement of the dimension of the phenomenon being studied.
Hosted by: Wei Ku
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