Session A12: Directed Organization of Nanostructured Films

8:00 AM–11:00 AM, Monday, March 16, 2009
Room: 308

Sponsoring Units: DMP DCMP
Chair: Ray Phaneuf, University of Maryland

Abstract ID: BAPS.2009.MAR.A12.3

Abstract: A12.00003 : Nanopatterning as a Probe of Unstable Growth on GaAs(001)

8:48 AM–9:00 AM

Preview Abstract MathJax On | Off   Abstract  

Authors:

  Krista Cosert
    (University of Maryland)

  Chuan-Fu Lin
    (University of Maryland)

  Ajmi Hammouda
    (University of Maryland)

  Hung-Chih Kan
    (National Chung-Cheng University, Taiwan, ROC)

  Kanakaraju Subrumaniam
    (Laboratory for Physical Sciences)

  Chris Richardson
    (Laboratory for Physical Sciences)

  Ray Phaneuf
    (University of Maryland)

We report on observations of unstable growth on nanopatterned GaAs(001) surfaces. For growth at 500$^{o}$C, 1 ML/sec and an As$_{2}$/Ga beam equivalent pressure ratio of 10:1, we find that grooves oriented at right angles to [110] produce a build up of ridges of GaAs at the upper edges, while for grooves oriented at right angles to [1\underline {1}0] no ridges form; instead cusps evolve at the bottoms of such grooves [1]. The cusp-forming grooves show a pronounced initial amplification of depth during growth which changes with length/width ratio, and become more narrow. The ridge-forming grooves instead broaden during growth. We compare these experimental observations with kinetic Monte Carlo simulations in which a small anisotropic Ehrlich-Schwoebel barrier is included. [1] T. Tadayyon-Eslami, H.-C. Kan, L. C. Calhoun and R. J. Phaneuf, \textit{Phys. Rev. Lett. }\textbf{97}, 126101 (2006)

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.A12.3