Comparing the local density of states of three- and two-dimensional electron systems by low-temperature scanning tunneling spectroscopy

Scanning tunneling spectroscopy of a dilute two-dimensional electron system exhibiting Rashba spin splitting

“…In previous STS studies, method (1) has been used revealing that a 2DES (K = 60 %) is prone to a much larger K-value than a three-dimensional system (K = 3 %), even if the potential disorder is quite similar. 44 Moreover, a drop of K from 90 % to 50 % has been found in a strongly disordered 2D system at the percolation transition of strongly localized states. 27 Our K-values are compatible with the previous values obtained on 2DESs, but, other than in the previous publications, K becomes continuously smaller with increasing energy.…”

“…16 Slight changes within the complex LDOS pattern might appear, if multiple scattering is involved, 17 but these changes could only be pinpointed by detailed comparison with LDOS calculations including the details of the disorder potential. 44 A more detailed theoretical consideration of the consequences of disorder on the Rashbasplit LDOS based on previous calculations 17,50 might be interesting base for such experiments. Notice that the width of the ring in the FFT of Fig.…”