The modelization of the Si/Ag(110) and Si/Ag(111) systems is generally based on the assumption of a complete immiscibility between silicon and silver. Recent results, on the contrary, demonstrated that in both cases the silver substrate is altered upon silicon deposition through Si-Ag exchange processes, either inducing substrate reconstructions [1] and faceting [2], or suggesting that Si-Ag reactivity must be taken into account. In this talk, I will at first survey our recent results on the Si/Ag(110) system [5], showing novel structural models for nanoribbons obtained considering missing-row reconstructions of the Ag(110) substrate. On the basis of STM measurements, Si coverage evaluation and density functional theory simulations, our models result to be thermodynamically stable, consistent with the experimental Si and Ag coverages, and yield simulated STM images in agreement with the measured data; in contrast, silicene-based models yield unsatisfactory results. Next, I'll discuss about our recently published paper [6] on the Si/Ag(111) that describes, through a combined DFT and STM study, the basic exchange mechanism between Si and the topmost layer Ag atoms that results in the growth of the well-known different kind of reconstructed domains inside, rather than on top, the first Ag(111) layer. [1] R. Bernard, T. Leoni, A. Wilson, T. Lelaidier, H. Sahaf, E. Moyen, L. Assaud, L. Santinacci, F. Leroy, F. Cheynis, A. Ranguis, H. Jamgotchian, C. Becker, Y. Borensztein, M. Hanbücken, G. Prévot, and L. Masson, Phys. Rev. B 88, 121411 (2013). [2] F. Ronci, G. Serrano, P. Gori, A. Cricenti, and S. Colonna, Phys. Rev. B 89, 115437 (2014). [3] J. Sone, T. Yamagami, Y. Aoki, K. Nakatsuji, and H. Hirayama, New J. Phys. 16, 095004 (2014). [4] G. Prévot, R. Bernard, H. Cruguel, and Y. Borensztein, Appl. Phys. Lett. 105, 213106 (2014). [5] C. Hogan, S. Colonna, R. Flammini, A. Cricenti, and F. Ronci, submitted. [6] M Satta, S. Colonna, R. Flammini, A. Cricenti, and F. Ronci, Phys. Rev. Lett. 115, 026102 (2015).
Si/Ag(110) and Si/Ag(111) systems reconsidered in light of Si-Ag reactivity
2015
Abstract
The modelization of the Si/Ag(110) and Si/Ag(111) systems is generally based on the assumption of a complete immiscibility between silicon and silver. Recent results, on the contrary, demonstrated that in both cases the silver substrate is altered upon silicon deposition through Si-Ag exchange processes, either inducing substrate reconstructions [1] and faceting [2], or suggesting that Si-Ag reactivity must be taken into account. In this talk, I will at first survey our recent results on the Si/Ag(110) system [5], showing novel structural models for nanoribbons obtained considering missing-row reconstructions of the Ag(110) substrate. On the basis of STM measurements, Si coverage evaluation and density functional theory simulations, our models result to be thermodynamically stable, consistent with the experimental Si and Ag coverages, and yield simulated STM images in agreement with the measured data; in contrast, silicene-based models yield unsatisfactory results. Next, I'll discuss about our recently published paper [6] on the Si/Ag(111) that describes, through a combined DFT and STM study, the basic exchange mechanism between Si and the topmost layer Ag atoms that results in the growth of the well-known different kind of reconstructed domains inside, rather than on top, the first Ag(111) layer. [1] R. Bernard, T. Leoni, A. Wilson, T. Lelaidier, H. Sahaf, E. Moyen, L. Assaud, L. Santinacci, F. Leroy, F. Cheynis, A. Ranguis, H. Jamgotchian, C. Becker, Y. Borensztein, M. Hanbücken, G. Prévot, and L. Masson, Phys. Rev. B 88, 121411 (2013). [2] F. Ronci, G. Serrano, P. Gori, A. Cricenti, and S. Colonna, Phys. Rev. B 89, 115437 (2014). [3] J. Sone, T. Yamagami, Y. Aoki, K. Nakatsuji, and H. Hirayama, New J. Phys. 16, 095004 (2014). [4] G. Prévot, R. Bernard, H. Cruguel, and Y. Borensztein, Appl. Phys. Lett. 105, 213106 (2014). [5] C. Hogan, S. Colonna, R. Flammini, A. Cricenti, and F. Ronci, submitted. [6] M Satta, S. Colonna, R. Flammini, A. Cricenti, and F. Ronci, Phys. Rev. Lett. 115, 026102 (2015).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
