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HL: Halbleiterphysik

HL 50: Poster II

HL 50.78: Poster

Donnerstag, 30. März 2006, 16:30–19:00, P3

Modeling the growth of quantum dot stacks via kinetic Monte Carlo simulations — •Roland Kunert and Eckehard Schöll — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin

We study the heteroepitaxial growth of self-assembled quantum dot stacks, grown in the Stranski-Krastanov growth mode, using kinetic Monte Carlo simulations.

The focus of our investigations is the effect of the three-dimensional anisotropic strain field induced by the lattice mismatch, which is computed self-consistently in the framework of elasticity theory. With this approach we can explain the seemingly contradictory predictions about the positions of anticorrelated stacks of quantum dots in theory[1] and experiment[2].

Using a hybrid method, we simulate the growth of the quantum dot arrays, taking into account the strain field generated by the layers beneath.

[1] V. Holý, G. Springholz, M. Pinczolits, and G. Bauer, Phys. Rev. Lett. 83, 356 (1999).

[2] X.-D. Wang, N. Liu, C. K. Shih, S. Govindaraju, and A. L. Holmes, Jr., Appl. Phys. Lett. 85, 1356 (2004).