Speaker
Description
The Chirality-Induced Spin Selectivity effect, the ability of chiral systems to spin-polarise the currents they are crossed by, has been widely reported since its discovery in 1999. However a general and comprehensive explanation is still missing. Focusing on carbon-based molecules whose chirality can be tuned by torsion, we investigate spin filtering effects on the transport properties by employing a spin-resolved non-equilibrium Green's function formalism based on fully relativistic density functional theory calculations. We compute, in particular, the chirality of the electronic states and the spin polarization of their conductance in dependence of their energy. We show that non-vanishing integral particles' chirality and spin-polarised conductance emerge naturally at finite torsions, by virtue of the full account of spin-orbit couplings. A large compensation between occupied states of similar energy, which limits the value of the integral quantities, highlights the importance of native structural chirality and of out of equilibrium conditions.
