000201463 001__ 201463
000201463 005__ 20230426083123.0
000201463 0247_ $$2doi$$a10.1103/PhysRevB.88.115435
000201463 0247_ $$2ISSN$$a0163-1829
000201463 0247_ $$2ISSN$$a0556-2805
000201463 0247_ $$2ISSN$$a1095-3795
000201463 0247_ $$2ISSN$$a1098-0121
000201463 0247_ $$2ISSN$$a1550-235X
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000201463 037__ $$aFZJ-2015-03758
000201463 041__ $$aEnglish
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000201463 1001_ $$0P:(DE-Juel1)141753$$aHell, Michael$$b0$$ufzj
000201463 245__ $$aTransport of spin anisotropy without spin currents
000201463 260__ $$aCollege Park, Md.$$bAPS$$c2013
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000201463 520__ $$aWe revisit the transport of spin-degrees of freedom across an electrically and thermally biased tunnel junction between two ferromagnets with noncollinear magnetizations. Besides the well-known charge current and spin current we show that a nonzero spin-quadrupole current flows between the ferromagnets. This tensor-valued current describes the nonequilibrium transport of spin anisotropy relating to both local and nonlocal multiparticle spin correlations of the circuit. This quadratic spin anisotropy, quantified in terms of the spin-quadrupole moment, is fundamentally a two-electron quantity. In spin valves with an embedded quantum dot such currents have been shown to result in a quadrupole accumulation that affects the measurable quantum dot spin and charge dynamics. The spin-valve model studied here allows fundamental questions about spin-quadrupole storage and transport to be worked out in detail, while ignoring the detection by a quantum dot. The physical understanding of this particular device is of importance for more complex devices where spin-quadrupole transport can be detected. We demonstrate that, as far as storage and transport are concerned, the spin anisotropy is only partly determined by the spin polarization. In fact, for a thermally biased spin valve the charge current and spin current may vanish, while a pure exchange spin-quadrupole current remains, which appears as a fundamental consequence of Pauli's principle. We extend the real-time diagrammatic approach to efficiently calculate the average of multiparticle spin observables, in particular the spin-quadrupole current. Although the paper addresses only leading-order and spin-conserving tunneling, we formulate the technique for arbitrary order in an arbitrary, spin-dependent tunnel coupling in a way that lends itself to extension to quantum-dot spin-valve structures.
000201463 536__ $$0G:(DE-HGF)POF2-422$$a422 - Spin-based and quantum information (POF2-422)$$cPOF2-422$$fPOF II$$x0
000201463 542__ $$2Crossref$$i2013-09-27$$uhttp://link.aps.org/licenses/aps-default-license
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000201463 7001_ $$0P:(DE-Juel1)130608$$aDas, Sourin$$b1$$ufzj
000201463 7001_ $$0P:(DE-Juel1)131026$$aWegewijs, Maarten Rolf$$b2$$eCorresponding Author$$ufzj
000201463 77318 $$2Crossref$$3journal-article$$a10.1103/physrevb.88.115435$$bAmerican Physical Society (APS)$$d2013-09-27$$n11$$p115435$$tPhysical Review B$$v88$$x1098-0121$$y2013
000201463 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.88.115435$$gVol. 88, no. 11, p. 115435$$n11$$p115435$$tPhysical review / B$$v88$$x1098-0121$$y2013
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000201463 9132_ $$0G:(DE-HGF)POF3-141$$1G:(DE-HGF)POF3-140$$2G:(DE-HGF)POF3-100$$aDE-HGF$$bForschungsbereich Energie$$lFuture Information Technology - Fundamentals, Novel Concepts and Energy Efficiency (FIT)$$vControlling Electron Charge-Based Phenomena$$x0
000201463 9131_ $$0G:(DE-HGF)POF2-422$$1G:(DE-HGF)POF2-420$$2G:(DE-HGF)POF2-400$$3G:(DE-HGF)POF2$$4G:(DE-HGF)POF$$aDE-HGF$$bSchlüsseltechnologien$$lGrundlagen zukünftiger Informationstechnologien$$vSpin-based and quantum information$$x0
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