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Modelling superheating of small Ga and Al clusters 10   m Krista G. Steenbergen Nicola Gaston, Dmitri Schebarchov, Shaun C. Hendy
Overview ,[object Object],[object Object],[object Object],[object Object],Dr. Gaston Drs. Schebarchov and Hendy
Melting of Small Particles A. A. Shvartsburg, M. F. Jarrold. PRL  85 , 2530 (2000) Ph. Buffat, J.-P. Borel, PRA  13 , 2287 (1976) T m   1/R
Small Al and Ga clusters G.A. Breaux et al, J. Am. Chem. Soc.  126 , 8628-9 (2004) C. M. Neal, A. K. Starce, M. F. Jarrold, PRB  76 , 054113 (2007)
Bulk gallium
Bulk gallium E. Voloshina, K. Rosciszewski and B. Paulus, Phys. Rev. B  79 , 045113 (2009) S.C. Hendy and N. Gaston, Superheating in Nanoparticles, The Handbook of Nanophysics  (2010)
Gallium Clusters ,[object Object],[object Object],[object Object]
Microcanonical Molecular Dynamics ,[object Object],Positions of atoms/electrons Calculate forces E 1 10,000 MD steps E 2 10,000 MD steps E 3 10,000 MD steps … E 19 10,000 MD steps
First-principles molecular dynamics ,[object Object],[object Object],Schrödinger   Newton electrons ions Monte Carlo “Dice Roll”
Computational Resources ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multiple Histogram Specific Heats
Cluster Melting Curve – Ga 20 Ga 20 Ga 20 + S. Krishnamurty et al. . PRB  73 , 045406 (2006)
Cluster Melting Curves – Ga 20 + Ga 20 + , less accurate potential than Ga 20 Ga 20 + S. Krishnamurty et al. . PRB  73 , 045406 (2006)
Cluster Melting Curves – Al 20 C. M. Neal et al. . PRB  76 ,  054113  (2007) 0 K 600 K 1200 K Al 20 Al 20 +
Cluster Melting Curves
Cluster Melting Curve – Ga 33 Ga 33 Ga 33 + G.A. Breaux et al, J. Am. Chem. Soc.  126 , 8628-9 (2004)
Structural Analysis ,[object Object],250 K 800 K 1150 K
Structural Analysis Ga 20 , 600 K Ga 20 , 1150 K
Future Work ,[object Object],[object Object],[object Object],[object Object],[object Object]
Many Thanks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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