Spin selectivity through time-reversal symmetric helical junctions

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Time-reversal symmetric charge and spin transport through a molecule comprising two-orbital channels and connected to two leads is analyzed. It is demonstrated that spin-resolved currents are generated when spin-flip processes are accompanied by a flip of the orbital channels. This surprising finding does not contradict Bardarson's theorem [J. H. Bardarson, J. Phys. A: Math. Theor. 41, 405203 (2008)1751-811310.1088/1751-8113/41/40/405203] for two-terminal junctions: the transmission does possess two pairs of doubly degenerate eigenvalues as required by the theorem. The spin-filtering effect is explicitly demonstrated for a two-terminal chiral molecular junction, modeled by a two-orbital tight-binding chain with intra-atomic spin-orbit interactions (SOI). In the context of transport through organic molecules like DNA, this effect is termed "chirality-induced spin selectivity"(CISS). The model exhibits spin splitting without breaking time-reversal symmetry: the intra-atomic SOI induces concomitant spin and orbital flips. Examining these transitions from the point of view of the Bloch states in an infinite molecule, it is shown that they cause shifts in the Bloch wave numbers, of the size of the reciprocal single turn, whose directions depend on the left and right handedness of the helix.

Original languageEnglish
Article number035445
JournalPhysical Review B
Issue number3
StatePublished - 15 Jul 2020


FundersFunder number
Japan Society for the Promotion of Science17K05575, 20H01827, 18KK0385
Israel Science Foundation
Ministry of Science and Technology, Israel3-11173
PAZY Foundation


    Dive into the research topics of 'Spin selectivity through time-reversal symmetric helical junctions'. Together they form a unique fingerprint.

    Cite this