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Coherent Formation, Detection and Control of Singlet and Triplet States in Cobalt Dimers Embedded Benzene Like Biased Tunneling Junctions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Quantum engineering architectures based on two spin systems, either coupled directly or through the RKKY interaction have been a matter of great interest in the latter experimental quests for optimal generation of quantum states. Novel mechanisms allowing the manipulation, detection and control have been the main driving force of these experimental efforts. In the present letter, we propose a molecular architecture in which a dimer of Cobalt atoms with eminent spin moment interact through the RKKY interaction via a host organic complex possessing a Benzene like orbital symmetry, enabling quantum coherent transport through the junction. By the action of a screened magnetic fieldĀ  and an electric field, a phase is induced in the overlap integral among single bonded molecular levels and double bond strengths is modulated respectively with the action from each field. We then show that a control protocol can be implemented to modulate the singlet-triplet states for low applied bias and that for large bias the weaker anti and ferromagnetic interactions can be as well tuned, hence, implementing complete manipulation of the entanglement of the proposed state. The proposed architecture uses differential conductivity based detection protocols, to establish the quantum state of the spin pair. To pursue single electron interferometry in the benzene like ring in the absence of electron-electron correlation, a strongly polarized ferromagnetic STM tip is used on a nonmagnetic host substrate.

National Category
Atom and Molecular Physics and Optics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-348660OAI: oai:DiVA.org:uu-348660DiVA, id: diva2:1198148
Available from: 2018-04-16 Created: 2018-04-16 Last updated: 2018-05-04

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