Probing negative differential resistance on [formula] surface with scanning tunneling microscopy

Weihua Wang; Aidi Zhao; Bing Wang; Hou, J. G.
June 2009
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p262108
Academic Journal
We present our study on the [formula] surface using scanning tunneling microscopy/spectroscopy. The results reveal that the well defined localized surface-state bands S2/S3 in the surface with lightly doped Si substrate play an important role in electron transport. The relative wide space charge layer beneath the surface interplays with the localized surface states, thus leading to the effect of the negative differential resistance.


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