Sr induced striped surface reconstructions formed on Si(111)

Teys, S.; Olshanetsky, B.; Zhachuk, R.; Pereira, S.; Norga, G.
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p161912
Academic Journal
Surface structures induced by submonolayer Sr adsorption on Si(111) surface were investigated by scanning tunneling microscopy (STM). Depending on the sample temperature and Sr coverage the following reconstructions on Si(111) surface could be directly resolved: 3×2, n×1 (n=5,7,9), 23×13, 43×43, and 3×2 with increasing Sr coverage. The 3×2 and 23×13 striped structures cover large surface areas and are found to have stripe-to-stripe separations of 1.00 and 1.34 nm, respectively. The surface structures and respective rotational and antiphase domains reported here can explain all the previously suggested reconstructions except 2×1, which was not found. It is also demonstrated that diffraction data may lead to ambiguous results regarding the structure periodicity, when structural antiphase domains with sizes below the coherence length are present, highlighting the importance of complementary real space STM analysis.


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