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Surface State Stark Shift in a Scanning Tunneling Microscope

L. Limot·T. Maroutian·P. Johansson·R. Berndt
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Abstract

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 $μ$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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L. Limot, T. Maroutian, P. Johansson, R. Berndt. 2003-09-17. Surface State Stark Shift in a Scanning Tunneling Microscope. https://doi.org/10.1103/physrevlett.91.196801

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