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| Previous: 4.2.2 Substrate Orientation (110) Up: 4.2 Strain Effects Next: 5. Physical Mobility Modeling | ||||
On (111) substrate only one subband ladder forms which is sixfold degenerate.
Biaxial in-plane strain does not split the 
valleys, hence the subband
ladders remain sixfold degenerate. The degeneracy can be lifted by
applying stress along one out of the two in-plane directions,
![$ [\bar{1}10]$](img777.png){kind=small}
or
![$ [11\bar{2}]$](img790.png){kind=small}
, since the resulting strain yields a different energy
shift (3.47) for different subband ladders.
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| Previous: 4.2.2 Substrate Orientation (110) Up: 4.2 Strain Effects Next: 5. Physical Mobility Modeling | ||||