Observation of Tunneling-Assisted Highly Forbidden Single-Photon Transitions in a Ni4 Single-Molecule Magnet
| Autor: | Chen Y., Ashkezari M.D., Collett C.A., Allao Cassaro R.A., Troiani F., Lahti P.M., Friedman J.R. |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Zdroj: | Physical review letters 117 (2016). doi:10.1103/PhysRevLett.117.187202 info:cnr-pdr/source/autori:Chen Y.; Ashkezari M.D.; Collett C.A.; Allao Cassaro R.A.; Troiani F.; Lahti P.M.; Friedman J.R./titolo:Observation of Tunneling-Assisted Highly Forbidden Single-Photon Transitions in a Ni4 Single-Molecule Magnet/doi:10.1103%2FPhysRevLett.117.187202/rivista:Physical review letters/anno:2016/pagina_da:/pagina_a:/intervallo_pagine:/volume:117 |
| Popis: | Forbidden transitions between energy levels typically involve violation of selection rules imposed by symmetry and/or conservation laws. A nanomagnet tunneling between up and down states violates angular momentum conservation because of broken rotational symmetry. Here we report observations of highly forbidden transitions between spin states in a Ni4 single-molecule magnet in which a single photon can induce the spin to change by several times â. nearly reversing the direction of the spin. These observations are understood as tunneling-assisted transitions that lift the standard ?m=±1 selection rule for single-photon transitions. These transitions are observed at low applied fields, where tunneling is dominated by the molecule's intrinsic anisotropy and the field acts as a perturbation. Such transitions can be exploited to create macroscopic superposition states that are not typically accessible through single-photon ?m=±1 transitions. |
| Databáze: | OpenAIRE |
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