Evaluation of electronic and transport properties of a nano-scale device in the presence of electric field

Modarresi, M.; Roknabadi, Mahmood Rezaee; Shahtahmasbi, N.; Vahedi, D.; Arabshahi, Hadi

doi:10.1016/j.physe.2010.08.021

Cited by 12 publications

(2 citation statements)

References 19 publications

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“…Using a tight-binding approach we describe the model quantum system and in the absence of any electronelectron (e-e) interaction this scheme is extremely suitable for analyzing electron transport through a conducting bridge [57][58][59][60][61][62][63][64] . The single particle TB Hamiltonian that includes the MQW, MQR and NM source and drain electrodes can be written as,…”

Section: Model and Theoretical Framework A Model And Hamiltonianmentioning

confidence: 99%

Externally controlled selective spin transfer through a two-terminal bridge setup

Maiti

2015

Eur. Phys. J. B

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A new way of getting controlled spin dependent transport through a two-terminal bridge setup is explored. The system comprises a magnetic quantum ring which is directly coupled to a magnetic quantum wire and subjected to an in-plane electric field perpendicular to the wire. Without directly changing system parameters, one can regulate spin currents simply by tuning the external electric field under a finite bias drop across the wire. For some particular field strengths a high degree of spin polarization can be achieved and thus the system can essentially be utilized as an externally controlled spin polarized device. A detailed comparison of spin current magnitudes obtained from other bridge setups is also examined to make the present investigation a self contained study.

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Section: Model and Theoretical Framework A Model And Hamiltonianmentioning

confidence: 99%

Externally controlled selective spin transfer through a two-terminal bridge setup

Maiti

2015

Eur. Phys. J. B

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“…It is the simplest conjugated polymer the properties of which mostly could be investigated using some simple model Hamiltonians [21,22]. Metal/polymer/metal tunnel junctions have already been theoretically characterized by several research groups [23][24][25][26]. In a majority of calculations performed using the tight-binding methods the p z electrons of polyacetylene were assumed to play a dominant role in electronic transport.…”

Section: Introductionmentioning

confidence: 99%

Multi-band tight-binding calculation of electronic transport in Fe/trans-polyacetylene/Fe tunnel junctions

Ravan¹

2012

Phys. Scr.

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In this paper, the electronic transport characteristics of Fe/trans-polyacetylene/Fe magnetic tunnel junctions (MTJs) are investigated using multi-band tight-binding calculations within the framework of nonequilibrium Green function theory. A CH2 radical is added to different positions on the polymer chain and its effects on the tunnelling magnetoresistance of the MTJ are studied. The ferromagnetic electrodes are assumed to be single-band and their tight-binding parameters are chosen in such a way as to simulate the ab initio density functional calculations of the band structure of bcc-Fe along its [001] crystallographic direction. In building the Hamiltonian of the trans-polyacetylene (t-PA) chain, we have assumed an s orbital on the H atoms and one s and three p(px,py,pz) orbitals on the C atoms, and the dimerization effects are taken into account. It is found that moving the radical out of the centre of the polymer chain enhances the tunnelling magnetoresistance of the MTJ.

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Spin-dependent transport characteristics of Fe met-cars

2013

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Evaluation of electronic and transport properties of a nano-scale device in the presence of electric field

Cited by 12 publications

References 19 publications

Externally controlled selective spin transfer through a two-terminal bridge setup

Externally controlled selective spin transfer through a two-terminal bridge setup

Multi-band tight-binding calculation of electronic transport in Fe/trans-polyacetylene/Fe tunnel junctions

Spin-dependent transport characteristics of Fe met-cars

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