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 μA)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 E0.Data taken are reproduced by a one-dimensional potential model calculation, and are found to yield a Stark-free energy E0 in agreement with recent state-of-the-art Photoemission Spectroscopy measurements.
@article{arxiv.cond-mat/0301568,
title = {Surface State Stark Shift in a Scanning Tunneling Microscope},
author = {L. Limot and T. Maroutian and P. Johansson and R. Berndt},
journal= {arXiv preprint arXiv:cond-mat/0301568},
year = {2009}
}
Comments
Accepted in Phys. Rev. Lett., 4 pages, 4 figures, revised version