Surface State Waves on Ag(111) at T=5K
Top: U = 7 mV, I = 0.33 nA, 50 nm x 50 nm (low-pass Fourier filtered);
bottom: as top but with U = 0.32 V (4-point averaged).
Standing surface state waves [1,2,3] around two surface defects on a Ag(111) film grown on HOPG have been imaged with the LT STM at T = 5 K in the constant-current mode. The two left images show the standing waves (upper image) and the corresponding topography (lower image). The hole defect and the adatom defect lead to distinct differences in the centre of the two circular waves which also exhibit pronounced interference effects.
U = 7 mV, I = 0.33 nA, 65 nm x 62 nm, (low-pass Fourier filtered).
The waves have also been imaged near a screw dislocation on the same surface. The confinement of the surface state waves in the triangle leads to pronounced constructive interference maxima.


Courtesy of : H. Hoevel, B. Grimm, M. Pollmann, B. Reihl, Universitaet Dortmund
References :
1. M. F. Crommie, C. P. Lutz, and D. M. Eigler, Nature 363, 524 (1993).
2. Y. Hasegawa and Ph. Avouris, Phys. Rev. Lett. 71, 1071 (1993).
3. J. Li, W. D. Schneider, and R. Berndt, Phys. Rev. B. 56, 7656 (1997).

 
This result has been obtained with :
LT STM

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