Double chain structures on the Sb-terminated GaAs(111)Bsurface

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Abstract
The interaction of Sb with the GaAs(111)B-(2×2) surface has been investigated using scanning tunneling microscopy. Pairs of parallel Sb lines oriented along the 〈110〉 directions and separated by three lattice constants are observed. Adjacent pairs are separated by p rows of atoms where p varies between two and five lattice constants. Between the line pairs we observe a pattern of Sb trimers with periodicity m parallel to the chains between three and seven lattice constants, which is determined by the value of p. The predominant unit cell corresponds to a 3×8 reconstruction. The local ordering can be understood in terms of electron counting.

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