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Cotunneling signatures of Spin-Electric coupling in frustrated triangularmolecular magnets
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Lund University. (condensed matter physics)
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering. Lund Univ,. (condensed matter physics)ORCID iD: 0000-0003-4489-7561
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 23, Article ID: 235435- p.Article in journal (Refereed) Published
Abstract [en]

The ground state of frustrated (antiferromagnetic) triangular molecular magnets is characterized by two total-spin S = 1/2 doublets with opposite chirality. According to a group theory analysis [M. Trif et al., Phys. Rev. Lett. 101, 217201 (2008)] an external electric field can efficiently couple these two chiral spin states, even when the spin-orbit interaction (SOI) is absent. The strength of this coupling, d, is determined by an off-diagonal matrix element of the dipole operator, which can be calculated by ab-initio methods [M. F. Islam et al., Phys. Rev. B 82, 155446 (2010)]. In this work we propose that Coulomb-blockade transport experiments in the cotunneling regime can provide a direct way to determine the spin-electric coupling strength. Indeed, an electric field generates a d-dependent splitting of the ground state manifold, which can be detected in the inelastic cotunneling conductance. Our theoretical analysis is supported by master-equation calculations of quantum transport in the cotunneling regime. We employ a Hubbard-model approach to elucidate the relationship between the Hubbard parameters t and U, and the spin-electric coupling constant d. This allows us to predict the regime in which the coupling constant d can be extracted from experiment.

 

Place, publisher, year, edition, pages
2014. Vol. 89, no 23, Article ID: 235435- p.
National Category
Physical Sciences
Research subject
Physics, Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-34400DOI: 10.1103/PhysRevB.89.235435ISI: 000339049700004OAI: oai:DiVA.org:lnu-34400DiVA: diva2:719722
Available from: 2014-05-26 Created: 2014-05-26 Last updated: 2016-11-01Bibliographically approved

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Nossa, JavierCanali, Carlo M.
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CiteExportLink to record
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Citation style
  • apa
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