Surface State Stark Shift in a Scanning Tunneling Microscope

Details Surface State Stark Shift in a Scanning Tunneling Microscope Surface State Stark Shift in a Scanning Tunneling Microscope

2003-01-29

arxiv.org/abs/cond-mat/0301568v2

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted in Phys. Rev. Lett., 4 pages, 4 figures, revised version

Scientific paper

10.1103/PhysRevLett.91.196801

We report a quantitative low-temperature Scanning Tunneling Spectroscopy (STS)study on the Ag(111) surface state over an unprecedented range of currents (50 pA to 6 $\mu$A)through which we can tune the electric field in the tunnel junction of the microscope. We show that in STS a sizeable Stark effect causes a shift of the surface state binding energy $E_{0}$.Data taken are reproduced by a one-dimensional potential model calculation, and are found to yield a Stark-free energy $E_{0}$ in agreement with recent state-of-the-art Photoemission Spectroscopy measurements.

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