Ultrafast Generation of Unconventional 001 Loops in Si
LA Marques and M Aboy and I Santos and P Lopez and F Cristiano and A La Magna and K Huet and T Tabata and L Pelaz, PHYSICAL REVIEW LETTERS, 119, 205503 (2017).
Ultrafast laser annealing of ion implanted Si has led to thermodynamically unexpected large 001 selfinterstitial loops, and the failure of Ostwald ripening models for describing self-interstitial cluster growth. We have carried out molecular dynamics simulations in combination with focused experiments in order to demonstrate that at temperatures close to the melting point, self-interstitial rich Si is driven into dense liquidlike droplets that are highly mobile within the solid crystalline Si matrix. These liquid droplets grow by a coalescence mechanism and eventually transform into 001 loops through a liquid-to- solid phase transition in the nanosecond time scale.
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