Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 33: Phase Transitions I

MM 33.7: Vortrag

Mittwoch, 25. März 2009, 16:15–16:30, IFW B

Fluence dependence of ultrafast transitions in Arsenic and Antimony — •Nils Huntemann, Eeuwe S. Zijlstra, and Martin E. Garcia — Theoretische Physik, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

We extend a previous theoretical study [E. Zijlstra et al., New J. Phys. 10, 033010 (2008)], in which we have predicted that a solid-solid phase transition from the A7 to the simple cubic phase can be induced by a laser in arsenic under pressure, to higher fluences up to 23 mJ/cm². This leads to a considerably decrease in the pressure that needs to be applied, namely from 23.8 GPa to 4.0 GPa, and for this reason reduces the experimental effort required for a confirmation.

We further investigate the structural changes of antimony under pressure, which has the same ground-state structure as arsenic, but undergoes transitions to different phases in interaction with femtosecond laser pulses.

The possibility of ultrafast, laser-induced melting for both materials after excitation is also discussed.