Overlap of periodic or quasi-periodic patterns creates a moire pattern.
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Twisted
Graphite. STM images of HOPG (highly ordered pyrolytic graphite)
captured by Virgil Elings of Digital Instruments in 1987 using a NanoScope
I STM. The long-wavelength periodic structures shown here are
attributed to Moire patterns in the surface electron density, induced by a
slight twist between the topmost and lower layers in the crystal.
(The linked document is a scan of STM application flyer #3. Copyright 1987
Digital Instruments, used by permission.)
Overlap of periodic or quasi-periodic patterns creates a moire pattern. |
More images are coming soon.
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updated 04/09/2007