Ballistic spin transport and spin interference in ferromagnet/InAs(2DES)/ferromagnet devices

Matsuyama, T.; Hu, Chang‐Ming; Grundler, D.; Meier, Guido; Merkt, U.

doi:10.1103/physrevb.65.155322

Cited by 154 publications

(113 citation statements)

References 53 publications

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“…In other words, the unitary transform changes us to a rotating frame. It is wellknown that for an electron moving along the x direction, the Rashba term H R1 gives rise to a spin precession 7,15 . That is, the spin component in the x-y plane will rotate as the electron moves along thex direction, therefore the electron spin is usually not invariant.…”

Section: B Rashba So Interaction (I)mentioning

confidence: 99%

“…After the unitary transformation Eqs. (15), u † (x)(σ x B x )u(x) =σ x B x so that it is affected by the transformation. The matrix elements ms ′ |u † (x)σ x B x u(x)|ns are found to be:…”

Section: E External Magnetic Fieldmentioning

confidence: 99%

“…found a resonant spin Hall conductance in a two-dimensional (2D) system with Rashba SO interaction under a perpendicular magnetic field 6 . There are also many other works on related issues where SO interaction plays a central role 12,13,14,15,16,17 , and this research direction is expanding in a very rapid pace due to its possible application to spintronics.…”

Section: Introductionmentioning

confidence: 99%

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Quantum transport theory for nanostructures with Rashba spin-orbital interaction

2005

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We report on a general theory for analyzing quantum transport through devices in the Metal-QD-Metal configuration where QD is a quantum dot or the device scattering region which contains Rashba spin-orbital and electron-electron interactions. The metal leads may or may not be ferromagnetic, they are assumed to weakly couple to the QD region. Our theory is formulated by second quantizing the Rashba spin-orbital interaction in spectral space (instead of real space), and quantum transport is then analyzed within the Keldysh nonequilibrium Green's function formalism. The Rashba interaction causes two main effects to the Hamiltonian: (i) it gives rise to an extra spin-dependent phase factor in the coupling matrix elements between the leads and the QD; (ii) it gives rise to an inter-level spin-flip term but forbids any intra-level spin-flips. Our formalism provides a starting point for analyzing many quantum transport issues where spin-orbital effects are important. As an example, we investigate transport properties of a Aharnov-Bohm ring in which a QD having Rashba spin-orbital and e-e interactions is located in one arm of the ring. A substantial spin-polarized conductance or current emerges in this device due to a combined effect of a magnetic flux and the Rashba interaction. The direction and strength of the spin-polarization are shown to be controllable by both the magnetic flux and a gate voltage.

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Section: B Rashba So Interaction (I)mentioning

confidence: 99%

Section: E External Magnetic Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum transport theory for nanostructures with Rashba spin-orbital interaction

2005

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“…[1,2] A number of studies have analyzed the spin polarized transport in ballistic regime and reported intriguing phenomena, [3,4] and have opened up the possibility of new spintronic devices. It is also interesting to study the spin-dependent transport in diffusive and chaotic regimes because the interference of coherent electron waves shows a number of characteristic effects when the spin degree of freedom is taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Conductance fluctuations in the presence of spin scattering

2003

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Electron transport through disordered systems that include spin scatterers is studied numerically. We consider three kinds of magnetic impurities: the Ising, the XY and the Heisenberg. By extending the transfer matrix method to include the spin degree of freedom, the two terminal conductance is calculated. The variance of conductance is halved as the number of spin components of the magnetic impurities increases. Application of the Zeeman field in the lead causes a further halving of the variance under certain conditions.

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“…Using boundary conditions [16,17,18] at the interfaces of SOC/non-SOC or magnetic/non-magnetic, we can get the transfer matrix [19,20] for the wave functions at j and j − 1 segments and obtain the outgoing spin states.…”

mentioning

confidence: 99%

Spin filtering implemented through Rashba spin-orbit coupling and weak magnetic modulations

Gong

Yang

2007

Journal of Applied Physics

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We present two theoretical schemes for spin filters in one-dimensional semiconductor quantum wires with spatially modulated Rashba spin-orbit coupling (SOC) as well as weak magnetic potential. For case I, the SOC is periodic and the weak magnetic potential is applied uniformly along the wire. Full spin polarizations with opposite signs are obtained within two separated energy intervals. For case II, the weak magnetic potential is periodic while the SOC is uniform. An ideal negative/positive switching effect for spin polarization is realized by tuning the strength of SOC. The roles of SOC, magnetic potential, and their coupling on the spin filtering are analyzed. Since spin states can be manipulated efficiently through spin-orbit couplings (SOCs) [9], one may carry out allelectric spin-based devices in SOC systems without the need of external magnetic field and magnetic materials. For example, when the transport occurs in multichannel regime, Rashba SOC [10] in two-terminal quantum wires can polarize the electron beams [11]. This behavior may be an alternative route for all-electric spin filters. However, for the view of the spintronic device performance, the single-channel devices are more desirable because they suffer from much less spin relaxation [12], which does harm to most spintronic devices. At the same time, single-channel sample is helpful for the miniaturization of the functional elements in devices. Thus, we focus our attention on one-dimensional quantum wires in the present work. Due to the time-reversal symmetry, the SOC alone in single-channel wires proves unable to generate any spin polarization [13], which means that spin filtering can not be realized through only SOC mechanism in single-channel wires. Because a weak magnetic field can break the time reversal symmetry [14], it is full of possibility to build spin filters in single-channel SOC systems with weak magnetic modulation by designing certain models.In the present work, we propose theoretical schemes for spin filters in one-dimensional quantum wires through modulations of both magnetic potentials and Rashba

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Ballistic spin transport and spin interference in ferromagnet/InAs(2DES)/ferromagnet devices

Cited by 154 publications

References 53 publications

Quantum transport theory for nanostructures with Rashba spin-orbital interaction

Quantum transport theory for nanostructures with Rashba spin-orbital interaction

Conductance fluctuations in the presence of spin scattering

Spin filtering implemented through Rashba spin-orbit coupling and weak magnetic modulations

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