Electron spins reflect chiral molecules without the mirror. The control of the chirality of molecules and crystals is crucial in various areas of research such as drug discovery and display technology. In recent times, innovative efforts have been made to utilize magnets to differentiate the handed
The handedness of a spiral structure is inverted by taking the mirror image. A spin chirality, which is represented by an antiparallel-spin pair, is inverted not only by taking the mirror image but also by running time backward, which is not the case with a spiral structure. Such a spin chirality was shown to be connected to a structural chirality by measurements on a chiral superconductor under alternating current excitation.
Stabilizing electron spins requires that the electrons be correlated, or interfere with each other, over the entire system. In a superconducting state, the interference persists via prolonged coherence of electrons; many electrons collapse into a single quantum-mechanical wave and jointly keep the capability of interference over a long distance. This feature may enable the emulation of the spin distribution in an organic chiral superconductor in a much larger length scale than chiral molecules.
“The observed spin distribution is relevant to chiral recognition” elaborates Assistant Prof. Daichi Hirobe, who is one of the two corresponding authors. “Depending on the handedness, two spin polarizations sit face-to-face or back-to-back at both edges of a superconductor. This unique configuration has been hypothesized for chiral molecules, but it has not been verified.
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