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Recently experiments have shown very significant spin activity in biologicalmolecules such as DNA, proteins, oligopeptides and aminoacids. Such moleculeshave in common their chiral structure, time reversal symmetry and the absenceof magnetic exchange interactions. The spin activity is then assumed to be dueto either the pure Spin-orbit (SO) interaction or SO coupled to the presence ofstrong local sources of electric fields. Here we derive an analyticaltight-binding Hamiltonian model for Oligopeptides that contemplates bothintrinsic SO and Rashba interaction induced by hydrogen bond. We use a lowestorder perturbation theory band folding scheme and derive the reciprocal spaceintrinsic and Rashba type Hamiltonian terms to evaluate the spin activity ofthe oligopeptide and its dependence of molecule uniaxial deformations. SOstrengths in the tens of meV are found and explicit spin active deformationpotentials. We find a rich interplay between responses to deformations both toenhance and diminish SO strength that allow for experimental testing of theorbital model. Qualitative consistency with recent experiments shows the roleof hydrogen bonding in spin activity.

Mechanically modulated spin orbit couplings in oligopeptides