Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-22
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 8 figures
Scientific paper
10.1103/PhysRevB.76.235318
The electronic properties of shallow acceptors in p-doped GaAs{110} are investigated with scanning tunneling microscopy at low temperature. Shallow acceptors are known to exhibit distinct triangular contrasts in STM images for certain bias voltages. Spatially resolved I(V)-spectroscopy is performed to identify their energetic origin and behavior. A crucial parameter - the STM tip's work function - is determined experimentally. The voltage dependent potential configuration and band bending situation is derived. Ways to validate the calculations with the experiment are discussed. Differential conductivity maps reveal that the triangular contrasts are only observed with a depletion layer present under the STM tip. The tunnel process leading to the anisotropic contrasts calls for electrons to tunnel through vacuum gap and a finite region in the semiconductor.
Dohler Gottfried H.
Loth Sebastian
Malzer Stefan
Ulbrich Rainer G.
Wenderoth Martin
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