Engineering Negative Differential Conductance with the Cu(111) Surface State

Details Engineering Negative Differential Conductance with the Cu(111) Surface State Engineering Negative Differential Conductance with the Cu(111) Surface State

2011-12-08

arxiv.org/abs/1112.1801v1

Phys. Rev. Lett. 107, 246801 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, 1 table

Scientific paper

10.1103/PhysRevLett.107.246801

Low-temperature scanning tunneling microscopy and spectroscopy are employed to investigate electron tunneling from a C60-terminated tip into a Cu(111) surface. Tunneling between a C60 orbital and the Shockley surface states of copper is shown to produce negative differential conductance (NDC) contrary to conventional expectations. NDC can be tuned through barrier thickness or C60 orientation up to complete extinction. The orientation dependence of NDC is a result of a symmetry matching between the molecular tip and the surface states.

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