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The nature of the alpha-Sn/Ge(111) surface is still a matter of debate. Inparticular, two possible configurations have been proposed for the 3x3 groundstate of this surface: one with two Sn adatoms in a lower position with respectto the third one (1U2D) and the other with opposite configuration (2U1D). Bymeans of first-principles quasiparticle calculations we could simulate STMimages as a function of bias voltage and compare them with STM experimentalresults at 78K, obtaining an unambiguous indication that the stableconfiguration for the alpha-Sn/Ge(111) surface is the 1U2D. The possibleinequivalence of the two down Sn adatoms is also discussed.

First-principles calculations and bias-dependent STM measurements at the alpha-Sn/Ge(111) surface: a clear indication for the 1U2D configuration