Journal
NANO LETTERS
Volume 13, Issue 6, Pages 2717-2722Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl400878r
Keywords
Bi(111); surface states; scattering vectors; standing waves; scanning tunneling spectroscopy; Fourier transform STM
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Funding
- German research council DFG [Sonderforschungsbereich (SFB) 616]
- Deutsche Forschungsgemeinschaft (DFG) [Sonderforschungsbereich 616]
- Studienstiftung des deutschen Volkes
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The electronic structure at the surface of Bi(111) enables us to study the effect of defects scattering into multiple channels. By performing scanning tunneling spectroscopy near step edges, we analyze the resulting oscillations in the local density of electronic states (LDOS) as function of position. At a given energy, forward and backward scattering not only occur simultaneously but may contribute to the same scattering vector Delta k. If the scattering phase of both processes differs by pi and the amplitudes are almost equal, the oscillations cancel out. A sharp dip in the magnitude of the Fourier transform of the LDOS marks the crossover between forward and backward scattering channels.
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