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Chirality-induced spin selectivity generates magnetocurrent in chiral molecules. This study reveals magnetocurrent

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Area of Science:

  • Condensed matter physics
  • Molecular electronics
  • Spintronics

Background:

  • Chirality-induced spin selectivity (CISS) is a phenomenon where chiral molecules induce spin polarization in charge transport.
  • Magnetocurrent, a key CISS manifestation, is defined as the change in current due to altered magnetization in a device.
  • Experimental observations of magnetocurrent in chiral molecular systems often show an odd voltage dependence, contrasting with some theoretical predictions.

Purpose of the Study:

  • To analytically investigate the voltage dependence of magnetocurrent in bipartite-chiral structures.
  • To clarify the role of Coulomb interactions and lead symmetries in magnetocurrent generation.
  • To reconcile theoretical predictions with experimental findings regarding magnetocurrent asymmetry.

Main Methods:

  • Analytical derivation of magnetocurrent in bipartite-chiral systems.
  • Utilizing Green's function formalism to analyze electron transport.
  • Employing wide-band and semi-infinite lead approximations.
  • Numerical simulations to validate analytical results.

Main Results:

  • Magnetocurrent mediated by Coulomb interactions is analytically shown to be exactly even in the wide band limit.
  • Magnetocurrent is analytically shown to be exactly odd for semi-infinite leads.
  • The bipartite lattice symmetry of the Green's function dictates the parity of the magnetocurrent.
  • Numerical results confirm the analytical predictions for both even and odd magnetocurrent behavior.

Conclusions:

  • The symmetry of the leads and the nature of interactions significantly influence the magnetocurrent's voltage dependence.
  • Coulomb interactions in bipartite-chiral systems can lead to both even and odd magnetocurrents depending on the lead characteristics.
  • This work provides a theoretical framework to understand the observed magnetocurrent asymmetry in molecular spintronic devices.