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Spin-dependent heat signatures of single-molecule spin dynamics
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-9217-2218
2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 11, article id 115416Article in journal (Refereed) Published
Abstract [en]

We investigate transient spin-dependent thermoelectric signatures in a single-molecule magnet under the effect of a time-dependent voltage pulse. We model the system using nonequilibrium Green's functions and a generalized spin equation of motion incorporating the dynamic electronic structure of the molecule. We show that the generated heat current in the system is due to both charge and spin contributions, related to the Peltier and the spin-dependent Peltier effect. There is also a clear signature in the heat current due to the spin dynamics of the single molecule and a possibility to control the spin-dependent heat currents by bias, tunneling coupling, and exchange interaction. A reversal of the net heat transfer in the molecule is found for increasing bias voltage due to the local Zeeman split and we can correlate the net heat transfer with the local anisotropies and dynamic exchange fields in the system.

Place, publisher, year, edition, pages
2019. Vol. 99, no 11, article id 115416
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-380458DOI: 10.1103/PhysRevB.99.115416ISI: 000460722300011OAI: oai:DiVA.org:uu-380458DiVA, id: diva2:1299822
Funder
Swedish Research Council, SNIC 2018/8-29Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-03-28Bibliographically approved

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Hammar, HenningJaramillo, Juan David VasquezFransson, Jonas

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