Spectroscopic signature of the Stark-shifted Tamm-type surface state of La(0001)

We have studied the Tamm-type surface state of La(0001) by tunneling spectroscopy within a wide range of tunneling currents from 0.1 nA to 8000 nA, thereby tuning the electric-field strength in a tip-vacuum-sample tunnel junction. We observe a significant shift of the unoccupied Tamm-type surface st...

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Bibliographic Details
Published in:New journal of physics 2020-09, Vol.22 (9), p.93013
Main Authors: Schreyer, Dominik, Kim, Howon, Wiesendanger, Roland
Format: Article
Language:English
Subjects:
Electric field strength
Fermi surfaces
Noble metals
Physics
scanning tunneling microscopy
scanning tunneling spectroscopy
Stark effect
surface states
Tunnel junctions
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Summary:We have studied the Tamm-type surface state of La(0001) by tunneling spectroscopy within a wide range of tunneling currents from 0.1 nA to 8000 nA, thereby tuning the electric-field strength in a tip-vacuum-sample tunnel junction. We observe a significant shift of the unoccupied Tamm-type surface state toward the Fermi energy with increasing electric-field strength, accompanied by a broadening of the width of the resonance peak indicating a decrease of the surface-state lifetime. Our experimental results are contrary to previous reports for Stark-shifted Shockley-type surface states of noble metal (111) surfaces.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ababc3