Related papers: Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions

Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions

URL: http://arxiv.org/abs/2005.01029v2
Date: Wed, 21 Jul 2021 14:40:23 GMT
Title: Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions
Authors: Junjie Liu, Jakub Mrozek, Aman Ullah, Yan Duan, Jos\'e J. Baldov\'i, Eugenio Coronado, Alejandro Gaita-Ari\~no, Arzhang Ardavan
Abstract summary: Electrical control of spins at the nanoscale offers architectural advantages in spintronics. Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising. E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
Score: 57.50861918173065
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: Electrical control of spins at the nanoscale offers significant architectural advantages in spintronics, because electric fields can be confined over shorter length scales than magnetic fields. Thus, recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising, raising the viability of the quantum analogues of macroscopic magneto-electric devices.However, the E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings. Here we show that one path is to identify an energy scale in the spin spectrum that is associated with a structural degree of freedom with a significant electrical polarisability. We study an example of a molecular nanomagnet in which a small structural distortion establishes clock transitions (i.e. transitions whose energy is to first order independent of magnetic field) in the spin spectrum; the fact that this distortion is associated with an electric dipole allows us to control the clock transition energy to an unprecedented degree. We demonstrate coherent electrical control of the quantum spin state and exploit it to manipulate independently the two magnetically-identical but inversion-related molecules in the unit cell of the crystal. Our findings pave the way for the use of molecular spins in quantum technologies and spintronics.

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