In the aniline-terminated polyyne we showed in the introduction (Figure ), the current runs linearly through the π-system when the endgroups are in parallel orientation. However, if Figure : Current density (top row), and magnetic field (middle and bottom row) of [5]-and [4]cumulenes. [5]cumulene is also shown with end-groups rotated into 60 circ orientation. Metabenzene is also shown with the bias opened around the HOMO resonance to achieve high current. The magnetic field is plotted as a vector field (middle row) and as the point where the field is strongest (bottom row). the groups are rotated the π-system becomes helical, and circular current patterns appear around the linear carbon chain. The current density and magnetic field for the polyyne with the end-groups at 60 • orientation is shown in Figure . The total current is reduced due to the torsion of the end-groups, and the ring currents run both ways around the ring. Still the ring current generate a magnetic field that is locally unidirectional, which at its strongest point in the middle of the linear carbon chain is in the µT range, similar in magnitude to the benzenes we have studied.