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The puzzle of contrast inversion in DNA STM imaging (issue cover)

Shapir, Errez ; Yi, Juyeon ; Cohen, Hezy ; Kotlyar, Alexander B. ; Cuniberti, Gianaurelio ; Porath, Danny



Abstract

DNA has been at the center of an imaging effort since the invention of the scanning tunneling microscope (STM). In some of the STM imaging reports the molecules appeared with negative contrast, i.e., ``submerged'' under the metal background and darker. We demonstrate the phenomenon of contrast inversion in DNA STM imaging by controlled and spontaneous contrast inversions and by the dependence of ...

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