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On the Origin of the Checkerboard Pattern in Scanning Tunneling Microscopy Maps of Underdoped Cuprate Superconductors
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-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
-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.Comment: 8 pages, 5 figures, final versio
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