Figure 1.

SEM images of as-deposited and annealed Au thin films of different thicknesses on GaAs(111)_B substrates. (a to e) Substrates with as-deposited Au thin films. (f to j) Substrates with Au thin film annealed at 600°C for 10 min. (k to o) Substrates with Au thin film annealed at 650°C for 10 min. The thicknesses of the Au thin films are 0.5, 1, 2, 3, and 5nm for (a to e), (f to j), and (k to o), respectively.