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Poster about atomic nanolines

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Poster presenting a new nanostructure composed of silicon atoms only.

Poster presenting a new nanostructure composed of silicon atoms only.

Published in: Science

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  • 1. Drawn freely with 1D templates for atomic chains on Si(001) ¹ Université de Genève, DPMC ² Department of Physics & Astronomy, UCL and LCN, London 1 1 11 1 2 F. Bianco, J. Owen, S. Köster, D. Mazur, D. Bowler and C. Renner 1 Haiku stripe Properties Bismuth nanolineMotivations 5 5 7 5 7 Haiku structure Composed of 5- and 7- fold rings of Si A Haiku (з ợ ) is a Japanese poem with 5-7-5 syllables Exactly 4 Si dimers wide (15.4 Å) Extends 5 layers below the surface Double row of Bi dimers perpendicular to Si dimers Review article : J. Mat. Sci 41 (14) 4568 (2006) Probe 1D physics experimentally Provide new way of growing atomic chains Alternative to vincinal surfaces Interconnects for novel electronics Allow the growth of 1D structures independent of step edges Perfectly straight, no kinks Can exceed 1µm in length Self-assembled structure with very few defects Stable up to 500°C in UHV Adsorption of metal along or in between the Bi dimers Matches DFT simulation very well State in the middle of structure seen in empty states imaging Many favorable sites for metal adsorption predicted by computation Best explained by removing Bi from Haiku structure RHEED shows an arc from a 1D structure, no more Bi peaks in XPS V = -3.0 V, I = 250 pA, T = 77 K V = -3.0 V, I = 250 pA, T = 77 K 古池や 蛙飛込む 水の音 * old pond... a frog leaps in water’s sound * Bi dimers are stripped by H Forms by exposing Bi nanolines to hydrogen Si monohydride surface passive in air, therefore likely to be stable in air Same structural properties as the Haiku core of Bi nanoline Provide direct observation of the Haiku structure Novel Si-only template, without any defects Stable up to 400°C in UHV Surface analysis After Bi deposition After H₂ deposition Binding energy Counts/s Bi Bi Si Si After H₂ Before H₂ Bi XPS RHEED Side view Outlook Determine transport properties of the templates Dope the Haiku stripes chemically or electrostatically Characterise templating properties Look for metallic properties Expose sample to air to confirm stability Haiku core structure - 0.3 V Filled states V = -2.9 V, I = 150 pA, T = 77 KV = - 2.5 V, I = 100 pA, T = 77 K Empty states + 1.8 V + 2.0 V + 2.5 V I = 150 pA, T = 77 K V = +2.0 V, I = 150 pA, T = 77 K