Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 8: Statistical Physics far from Thermal Equilibrium

DY 8.12: Vortrag

Montag, 20. März 2017, 18:00–18:15, ZEU 118

Reducing the roughness in non-equilibrium surface growth by controlled temperature modulations — •Thomas Martynec and Sabine H.L. Klapp — Institut für Theoretische Physik, Technis- che Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

The non-equilibrium crystal growth often leads to undesired rough interfaces which negatively affect the quality of devices. By controlled temperature modulations during the non-equilibrium growth it is possible to overcome this problem and obtain smoother structures. The idea is based on the concept of two mobilities [1] which is realized by using different temperatures T during the growth such that the nucleation length associated with second layer nucleation is changed. Using a low temperature T in the early stage of growth and increasing it during the growth leads to small islands and reduces the rate of second layer nucleation. The goal is to find optimal T-modulations by means of kinetic Monte-Carlo simulations such that coalescence of clusters sets in before it comes to nucleation in the layer above and the structure growths in a layer-by-layer fashion.

[1] G. Rosenfeld, B. Poelsema, G. Comsa, J. Cryst. Growth 151, 230-233 (1995)

[2] R. Kunkel, B. Poelsema, L. K. Verheij, G. Comsa, Phys. Rev. Lett. 65, 733 (1990)

[3] P. Šmilauer, M. R. Wilby, D. D. Vvedensky, Phys. Rev. B 47, 4119(R) (1993)

[4] S. Kowarik et al., unpublished.