Magnon transport and spin current switching through quantum dots

Strelcyk, Olaf; Korb, Thomas; Schoeller, Herbert

doi:10.1103/physrevb.72.165343

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…Technique. -In order to evaluate the transport properties of the quantum dot system, we use a real-time diagrammatic approach [23,24] in its extensions to systems with ferromagnetic [25] and magnonic [26] reservoirs. The idea of this approach is to split the system into the strongly interacting quantum dot region with only few degrees of freedom and the noninteracting reservoirs with many degrees of freedom.…”

mentioning

confidence: 99%

Magnon-driven quantum-dot heat engine

Sothmann¹,

Büttiker²

2012

EPL

141

136

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We investigate a heat-to charge-current converter consisting of a single-level quantum dot coupled to two ferromagnetic metals and one ferromagnetic insulator held at different temperatures. We demonstrate that this nano engine can act as an optimal heat to spin-polarized charge current converter in an antiparallel geometry, while it acts as a heat to pure spin current converter in the parallel case. We discuss the maximal output power of the device and its efficiency.

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confidence: 99%

Magnon-driven quantum-dot heat engine

Sothmann¹,

Büttiker²

2012

EPL

141

136

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“…Introduction.-In recent years, the field of Spintronics has attracted increasing interest [1,2]. A considerable amount of theoretical and experimental attention has been focused on transport phenomena, especially spindependent charge currents in low-dimensional structures made of magnetic materials [3,4,5], but also transport of magnetization through insulating spin chains and quantum dots [6,7].…”

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confidence: 99%

Fingerprints of the Magnetic Polaron in Nonequilibrium Electron Transport through a Quantum Wire Coupled to a Ferromagnetic Spin Chain

2006

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We study nonequilibrium quantum transport through a mesoscopic wire coupled via local exchange to a ferromagnetic spin chain. Using the Keldysh formalism in the self-consistent Born approximation, we identify fingerprints of the magnetic polaron state formed by hybridization of electronic and magnon states. Because of its low decoherence rate, we find coherent transport signals. Both elastic and inelastic peaks of the differential conductance are discussed as a function of external magnetic fields, the polarization of the leads and the electronic level spacing of the wire.

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“…This is because quantum dot based systems allow for a relatively easy control of single particle transport by external gates. Recently, quantum dot based heat engines have been proposed [20][21][22][23][24][25][26][27][28][29] , where the temperature gradient has been shown to drive electron and magnon currents or phonon-assisted and magnonassisted electron currents. The considerations, however were usually limited to the lowest-order processes, i.e.…”

Section: Introductionmentioning

confidence: 99%

Magnon cotunneling through a quantum dot

Karwacki

2017

Journal of Magnetism and Magnetic Materials

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I consider a single-level quantum dot coupled to two reservoirs of spin waves (magnons). Such systems have been studied recently from the point of view of possible coupling between electronic and magnonic spin currents. However, usually weakly coupled systems were investigated. When coupling between the dot and reservoirs is not weak, then higher order processes play a role and have to be included. Here I consider cotunneling of magnons through a spin-occupied quantum dot, which can be understood as a magnon (spin) leakage current in analogy to leakage currents in charge-based electronics. Particular emphasis has been put on investigating the effect of magnetic field and temperature difference between the magnonic reservoirs.Comment: 6 pages, 4 figure

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Magnon transport and spin current switching through quantum dots

Cited by 5 publications

References 20 publications

Magnon-driven quantum-dot heat engine

Magnon-driven quantum-dot heat engine

Fingerprints of the Magnetic Polaron in Nonequilibrium Electron Transport through a Quantum Wire Coupled to a Ferromagnetic Spin Chain

Magnon cotunneling through a quantum dot

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