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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| Veröffentlicht in: | New journal of physics 2020-09, Vol.22 (9), p.93013, Article 093013 |
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| creator | Schreyer, Dominik Kim, Howon Wiesendanger, Roland |
| description | 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. |
| doi_str_mv | 10.1088/1367-2630/ababc3 |
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| subjects | Electric field strength Fermi surfaces Noble metals Physical Sciences Physics Physics, Multidisciplinary scanning tunneling microscopy scanning tunneling spectroscopy Science & Technology Stark effect surface states Tunnel junctions |
| title | Spectroscopic signature of the Stark-shifted Tamm-type surface state of La(0001) |
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