Chirality-Induced Spin Filtering in Pseudo Jahn-Teller Molecules

Abstract

Chirality-induced spin selectivity (CISS) refers to an ability to induce a spin polarization of an electron transmitted through chiral materials. An important experimental observation is that incredibly large spin polarization is realized at room temperature even for organic molecules that have weak spin-orbit coupling (SOC), although SOC is the only interaction that can manipulate the electrons' spins in the setups. Therefore, the mechanism of the CISS needs to be constructed in a way insensitive to or enhancing the magnitude of the SOC strength. In this paper, we describe a theoretical study of CISS with a model chiral molecule that belongs to the point group ${\mathrm{C}}_3$. In this molecule, electronic translational and rotational degrees of freedom for an injected electron are coupled to one another via the nuclear vibrational mode with a pseudo Jahn-Teller effect. By properly taking the molecular symmetry as well as the time-reversal symmetry into account and classifying the molecular ground states by their angular- and spin-momentum quantum numbers, we show that the chiral molecule can act as an efficient spin filter. The efficiency of this spin filtering can be nearly independent of the SOC strength in this model, while it well exceeds the spin polarization relying solely on the SOC. The nuclear vibrations turned out to have the role of not only mediating the translation-rotation coupling, but also enhancing the spin-filtering efficiency.

9pages, 4 figures

References in corpus (5)

• Chirality Induced Spin Selectivity -- The Role of Electron Correlations
• Vibration-Enhanced Spin-Selective Transport of Electrons in DNA Double Helix
• A proof of the Kramers degeneracy of transmission eigenvalues from antisymmetry of the scattering matrix
• The Jahn-Teller effect and spin--orbit coupling: friends or foes?
• Spin selectivity through time-reversal symmetric helical junctions

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• On the definition of chirality and enantioselective fields
• The Chiral Induced Spin Selectivity Effect -- What It Is, What It Is Not, And Why It Matters
• Quantification of chirality based on electric toroidal monopole
• Chirality-induced Phonon-Spin Conversion at an Interface
• Theory of Energy Dispersion of Chiral Phonon
• Emergence of chirality by multipole interconversion
• Theory of spin Seebeck effect activated by acoustic chiral phonons
• Predominant Electronic Order Parameter for Structural Chirality -- Role of Spinless Electronic Toroidal Multipoles
• Floquet-engineered chiral-induced spin selectivity
• Coherent two-dimensional THz magnetic resonance spectroscopies for molecular magnets: Analysis of Dzyaloshinskii-Moriya interaction
• Electronic and Spin States at Edges of Finite $p$-orbital Helical Atomic Chain
• Weak Electron-Phonon Coupling Is Insufficient to Generate Significant CISS in Two-Terminal Transport