Spin diode based on a single-walled carbon nanotube

Weymann, Ireneusz; Barnaś, J.

doi:10.1063/1.2894224

Cited by 30 publications

(18 citation statements)

References 24 publications

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“…This behavior was also observed in resonance tunneling connected to ferromagnetic contacts with different spin-dependent transparencies [20]. Spin diodes have been theoretically investigated without taking into account spin-flip [21,22]. In this paper, we analyze this structure with taking into account spin-flip process in sequential tunneling regime.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spin-Flip on the Performance of the Spin-Diode

Tagani

Soleimani

2011

Mod. Phys. Lett. B

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We study spin-dependent transport through a spin diode in the presence of spin-flip by means of reduced density matrix approach. The current polarization and the spin accumulation are computed and influence of spin-flip on the current polarization is also analyzed. Analytical relations for the current polarization and the spin accumulation are obtained as a function of polarization of ferromagnetic lead and the spin-flip rate. It is observed that the current polarization becomes zero under fast spin-flip and the spin accumulation decreases up to %85 when the time of spin-flip is equal to the tunneling time. It is also observed that the current polarization increases linearly when the dot is singly occupied, whereas its behavior is more complicated when the dot is doubly occupied.

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Section: Introductionmentioning

confidence: 99%

Influence of Spin-Flip on the Performance of the Spin-Diode

Tagani

Soleimani

2011

Mod. Phys. Lett. B

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“…When a large natural molecule is weakly attached to metallic leads, it can be treated simply as a multi-level QD [203,204,205]. As a specific case, we discuss transport properties of a single-wall metallic carbon nanotube (CNT) weakly coupled to ferromagnetic leads [206,207,208,209,210].…”

Section: Multi-level Quantum Dots Based On Single-wall Carbon Nanotubesmentioning

confidence: 99%

Spin effects in single-electron tunnelling

Barnaś¹,

Weymann²

2008

J. Phys.: Condens. Matter

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Abstract. An important consequence of the discovery of giant magnetoresistance in metallic magnetic multilayers is a broad interest in spin dependent effects in electronic transport through magnetic nanostructures. An example of such systems are tunnel junctions -single-barrier planar junctions or more complex ones. In this review we present and discuss recent theoretical results on electron and spin transport through ferromagnetic mesoscopic junctions including two or more barriers. Such systems are also called ferromagnetic single-electron transistors. We start from the situation when the central part of a device has the form of a magnetic (or nonmagnetic) metallic nanoparticle. Transport characteristics reveal then single-electron charging effects, including the Coulomb staircase, Coulomb blockade, and Coulomb oscillations. Single-electron ferromagnetic transistors based on semiconductor quantum dots and large molecules (especially carbon nanotubes) are also considered. The main emphasis is placed on the spin effects due to spin-dependent tunnelling through the barriers, which gives rise to spin accumulation and tunnel magnetoresistance. Spin effects also occur in the current-voltage characteristics, (differential) conductance, shot noise, and others. Transport characteristics in the two limiting situations of weak and strong coupling are of particular interest. In the former case we distinguish between the sequential tunnelling and cotunnelling regimes. In the strong coupling regime we concentrate on the Kondo phenomenon, which in the case of transport through quantum dots or molecules leads to an enhanced conductance and to a pronounced zero-bias Kondo peak in the differential conductance.

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“…Another interesting situation occurs when the nanotube is coupled to one magnetic and one ferromagnetic lead. In this case the nanotube can operate as a spin diode [11,12]. In Fig.…”

Section: Resultsmentioning

confidence: 99%

Transport through Single-Wall Carbon Nanotubes Weakly Coupled to External Leads

2009

Self Cite

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We consider transport properties of single-wall metallic carbon nanotubes weakly coupled to external leads. In particular, we analyze the conductance and shot noise of nanotubes coupled to nonmagnetic leads and show that the shot noise may become super-Poissonian depending on the ground state of the nanotube. In addition, we also show that when the nanotube is coupled to one ferromagnetic and one nonmagnetic lead, it can operate as a gate-controlled spin diode.

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Spin diode based on a single-walled carbon nanotube

Cited by 30 publications

References 24 publications

Influence of Spin-Flip on the Performance of the Spin-Diode

Influence of Spin-Flip on the Performance of the Spin-Diode

Spin effects in single-electron tunnelling

Transport through Single-Wall Carbon Nanotubes Weakly Coupled to External Leads

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