Quantum Coherence in an Exchange-Coupled Dimer of Single-Molecule Magnets

Abstract

A multi- high-frequency electron paramagnetic resonance method is used to probe the magnetic excitations of a dimer of single-molecule magnets. The measured spectra display well-resolved quantum transitions involving coherent superposition states of both molecules. The behavior may be understood in terms of an isotropic superexchange coupling between pairs of single-molecule magnets, in analogy with several recently proposed quantum devices based on artificially fabricated quantum dots or clusters. These findings highlight the potential utility of supramolecular chemistry in the design of future quantum devices based on molecular nanomagnets.

Luminescence and Single‐Molecule‐Magnet Behaviour in Lanthanide Coordination Complexes Involving Benzothiazole‐Based Tetrathiafulvalene Ligands

“…[5][6][7] The origin of this keen interest comes from their particular magnetic characteristics (high magnetic moments and strong magnetic anisotropy) and specific luminescence. Both SMMs and luminescent materials have a plethora of potential applications, for example, high-density data storage, spintronics and quantum computing, [8][9][10][11][12][13][14][15] organic light-emitting diodes (OLEDs), [16] time-resolved fluoro-immunoassays, [17] biosensors [18,19] and time-resolved imaging. [20] In the molecular-magnetism field, the luminescence was recently exploited to provide a high level of comprehension of the magnetic properties.…”

Spin dynamics of molecular nanomagnets unravelled at atomic scale by four-dimensional inelastic neutron scattering

“…Shells of organic ligands provide magnetic separation between adjacent magnetic cores, which behave as identical and independent zero-dimensional units [1]. The magnetic dynamics are characterized by strong quantum fluctuations and this makes MNMs of great interest in quantum magnetism as model systems to investigate a range of phenomena, such as quantum-tunnelling of the magnetization [2][3][4], Néel-vector tunnelling (NVT) [5,6], quantum information processing [7][8][9], quantum entanglement [10][11][12][13] or decoherence [14][15][16]. Besides their fundamental interest, MNMs are also the focus of intense research for the potential technological applications as classical or quantum bits [1,[7][8][9]17] and as magnetocaloric refrigerants [18].…”

Diffusion inélastique des neutrons sur les aimants moléculaires

“…Avec les agrégats moléculaires, on cherche à créer une quantité élémentaire ("bit") d'information aussi petite que possible. Ces bits quantiques magnétiques [31,65,75,112] sont l'étape ultime de la miniaturisation, cependant, l'environnement cristallin (interactions avec le monde extérieur), modifiant la stabilité et la dynamique de ces sytèmes (phénomènes de décohérence quantique), conduit à une perte de l'information portée par la molécule et constitue un obstacle majeur au développement de la spintronique moléculaire [94]. Un travail récent de "fonctionalisation" de ces matériaux moléculaires a été entrepris notamment sur des surfaces [34,70,100], ou par organisation en films de LangmuirBlodgett [45,46,102].…”