Wednesday, July 13, 2011, 1:30 pm — Bldg. 480 conference room
A complicating factor in unraveling the theory of high-temperature superconductivity is the presence of a “pseudogap” in the density of states, whose origin has been debated since its discovery. Some believe the pseudogap is a broken symmetry state distinct from superconductivity, while others believe it arises from short-range correlations without any symmetry breaking. It remains crucial to determine which (if any) symmetries are broken by this state, and whether it enhances, contests, or coexists innocuously with superconductivity. It is also important to disentangle electronic symmetry breaking of the pseudogap state, from pre-existing structural symmetry of the crystal. We use scanning-tunneling microscopy (STM), in conjunction with a novel algorithm to extract surface atom locations with picometer precision, to detect an orthorhombic structural distortion across the Bi2Sr2Can-1CunO2n+4+x (BSCCO) family tree. This distortion breaks two-dimensional inversion-symmetry in the surface BiO layer, which will impact the electronic density of states symmetries observed by ARPES and spectroscopic STM.
Hosted by: Ivan Bozovic
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