Observation of spin-electric transitions in a molecular exchange qubit
arxiv(2024)
摘要
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 the first
experimental evidence of 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.
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