Modeling electron-spin accumulation in a metallic nanoparticle

Wei, Yaguang; Malec, C. E.; Davidović, Dragomir

doi:10.1103/physrevb.78.035435

Cited by 10 publications

(27 citation statements)

References 50 publications

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“…The average spin of the particle will point along the magnetic-field direction. By exchanging P with P cos͑␣͒ and using the spin-accumulation model appropriate for our samples, 9 we find…”

Section: Quenching Of Electron Spin Precession In a Metallic Partmentioning

confidence: 99%

“…The similarity between that spin-flip rate and the tunnel rate made it possible to explore the energy dependence of the spin-flip rate by transport measurements. 5,9 The spin-conserving energy relaxation rate in the particle is much faster than the spin-relaxation rate. The spinconserving energy relaxation occurs primarily through phonon emission and it is mediated by the electron-phonon interaction.…”

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

“…2͑a͒ are responsible for spin accumulation and spin-polarized current. 9 Detailed discussion of the various internal transitions in the particle are available in Ref. 9.…”

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

“…9 Detailed discussion of the various internal transitions in the particle are available in Ref. 9. Figure 3͑a͒ displays the I-V curve of one device at 4.2 K, which exhibits CB.…”

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

“…The electron-spin direction in such a particle can decay only by some coupling to the environment. 5,9 Evidence of long spin-relaxation time in metallic particles has been seen in spin-injection experiments where a single or an array of particles is attached by tunnel contacts to two ferromagnets. 5,10,11 The main question addressed in this paper is whether the spin injected into the particle by tunneling from a ferromagnet exhibits precessional motion about a perpendicular magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Spin-polarized electron tunneling through an aluminum particle in a noncollinear magnetic field

2009

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We present measurements of spin-polarized electron tunneling through a nanometer-scale Al particle in contact with two ferromagnets as a function of the direction of the applied magnetic field at 4.2 K. We find that if the magnetizations of the ferromagnets are aligned parallel, the tunnel current has a weak dependence on magnetic-field direction I ↑↑ Ϸ const, while if the magnetizations of the ferromagnets are aligned antiparallel, the current has significant dependence on magnetic-field direction I ↑↓ ͑␣͒ϷI ↑↑,0 sin 2 ͑␣͒ + I ↑↓,0 cos 2 ͑␣͒, where ␣ is the angle between the magnetic field and the magnetizations. Those dependencies are in agreement with the model of spin accumulation by incoherent electron transport via Zeeman-split energy levels of the particle. They demonstrate that the electron spin in the particle at finite current accumulates along the direction of the magnetic field rather than the magnetization direction. In zero magnetic field, the spin-accumulation direction is set by the field of the environment making it possible to study inhomogeneous spin dephasing. A lower limit of 8 ns is found for the inhomogeneous spin-dephasing time.

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Section: Quenching Of Electron Spin Precession In a Metallic Partmentioning

confidence: 99%

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

“…2͑a͒ are responsible for spin accumulation and spin-polarized current. 9 Detailed discussion of the various internal transitions in the particle are available in Ref. 9.…”

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

“…9 Detailed discussion of the various internal transitions in the particle are available in Ref. 9. Figure 3͑a͒ displays the I-V curve of one device at 4.2 K, which exhibits CB.…”

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spin-polarized electron tunneling through an aluminum particle in a noncollinear magnetic field

2009

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Spin entanglement generation and detection in semiconductor nanostructures

Belzig

Bednorz

2014

Physica Status Solidi (b)

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Entanglement, viz. the non-separability of quantum states, is a fundamental prediction of quantum mechanics, which is at odds with the classical perception of reality. Furthermore, it constitutes a resource for quantum computation and quantum communication. Electronic degrees of freedom in nanostructures -in particular the spin -constitute promising candidates to implement quantum information architectures in scalable solid state circuits. In this topical review, we will summarize some efforts to create and detect entanglement in such structures. We concentrate first on entanglement in double quantum dots, since they promise to be viable candidates to produce entanglement by confining electrons to a small interaction region.The quantitative detection of the entanglement through transport measurements can be done via current and noise. Secondly, we concentrate on the creation of spin entanglement at quantum point contacts, which has the advantage that the two electrons are automatically spatially separated. We discuss the possibility of performing a Bell test of non-local correlations. However, as we will point out, a reliable entanglement detection can be performed by current-correlation measurements, although they require some trust in the experimental setup. Finally, we present a hierarchy of mesoscopic Bell tests, which could be useful to evaluate theoretical proposals and experimental setups.

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