A union of the real-space and reciprocal-space view of the GaAs(001) surface

A union of the real-space and reciprocal space view of the GaAs(001) surfac e is presented. An optical transmission temperature measurement system allo wed fast and accurate temperature determinations of the GaAs(001) substrate . The atomic features of the GaAs(001)-(2 x 4) reconstructed surface are re solved with scanning tunneling microscopy and first principles density func tional theory. In addition, the 2D lattice-gas Ising model within the grand canonical ensemble can be applied to this surface to understand the thermo dynamics. An algorithm for using electron diffraction on the GaAs(001) surf ace to determine the substrate temperature and tune the nanoscale surface r oughness is presented.