Probing spin-electric transitions in a molecular exchange qubit

Florian Mardelé, Ivan Mohelský, Jan Wyzula, Milan Orlita, Philippe Turek, Filippo Troiani () and Athanassios K. Boudalis ()
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Florian Mardelé: 25 rue des Martyrs
Ivan Mohelský: 25 rue des Martyrs
Jan Wyzula: 25 rue des Martyrs
Milan Orlita: 25 rue des Martyrs
Philippe Turek: Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032
Filippo Troiani: Istituto Nanoscienze—CNR, Centro S3, via Campi 213a
Athanassios K. Boudalis: Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra), Université de Strasbourg, 4 rue Blaise Pascal, CS 90032

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Electric fields represent an ideal means for controlling spins at the nanoscale and, more specifically, for manipulating protected degrees of freedom in multispin systems. Here we perform low-temperature magnetic far-IR spectroscopy on a molecular spin triangle (Fe3) and provide initial experimental evidence suggesting spin-electric transitions in polynuclear complexes. The co-presence of electric- and magnetic-dipole transitions, allows us to estimate the spin-electric coupling. Based on spin Hamiltonian simulations of the spectra, we identify the observed transitions and introduce the concept of a generalized exchange qubit. This applies to a wide class of molecular spin triangles, and includes the scalar chirality and the partial spin sum qubits as special cases.

Date: 2025
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DOI: 10.1038/s41467-025-56453-1

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