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On the Origin of the Checkerboard Pattern in Scanning Tunneling Microscopy Maps of Underdoped Cuprate Superconductors

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arxiv 0908.0412 v3 pith:OD5QUTOQ submitted 2009-08-04 cond-mat.supr-con cond-mat.str-el

On the Origin of the Checkerboard Pattern in Scanning Tunneling Microscopy Maps of Underdoped Cuprate Superconductors

classification cond-mat.supr-con cond-mat.str-el
keywords checkerboardpatternaboveasymmetryconductancedifferentialmapsorigin
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The checkerboard pattern in the differential conductance maps on underdoped cuprates appears when the STM is placed above the O-sites in the outermost CuO$_{\text{2}}$-plane. In this position the interference between tunneling paths through the apical ions above the neighboring Cu-sites leads to an asymmetric weighting of final states in the two antinodal regions of ${\boldsymbol{k}}$-space. The form of the asymmetry in the differential conductance spectra in the checkerboard pattern favors asymmetry in the localization length rather than a nematic displacement as the underlying origin.

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