Externally controlled high degree of spin polarization and spin inversion in a conducting junction: Two new approaches

Patra, Moumita; Maiti, Santanu K.

doi:10.1038/s41598-017-14499-2

Cited by 45 publications

(15 citation statements)

References 60 publications

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“…This behavior observed in Ref. (Patra & Maiti, 2017b) The two antiresonances for all values of donor-acceptor coupling appear at . While donor-acceptor coupling leads to shift the antiresonances located at other energies.…”

Section: A Transmission Probabilitysupporting

confidence: 56%

“…The operation of such two-terminal devices gets due to applying a bias voltage. The transport properties of these systems are associated with some quantum effects, like as quantization of energy levels, quantum interference of electron waves (Baer & Neuhauser, 2002a, 2002bErnzerhof et al, 2006;Frauenheim et al, 2002;Goldsmith et al, 2006;Launay & Coudret;Magoga & Joachim, 1999;Tagami et al, 2003;Walter et al, 2004). The thermoelectric effects with improved efficiency can be thought as an alternative option for the future energy requirements (Ashcroft & Mermin, 1976;Ke et al, 2009;Majumdar, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…This configuration investigated for magnetic quantum ring and benzene molecule in Refs. (Patra & Maiti, 2017a, 2017b. Our calculations based on steady-state theoretical formalism to calculate transmission probability, electric current and thermoelectric properties of single pyrene molecule connected to two metallic electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Direct Coupling on Electronic Transport and Thermoelectric Properties of Single Pyrene Molecule

Mutier¹,

Al-Badry²

2021

UTJsci

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Electron transport characteristics through a single pyrene molecule, which connects with two metallic electrodes, are investigated by using of steady-state theoretical formalism. The transmission probability, I-V characteristics and thermoelectric properties are studied according to the influence of direct coupling between donor and acceptor. The new path between the donor and acceptor provides a direct route for the transfer of electrons between the donor and the acceptor, as well as the transfer of electrons across the molecule. We find the electronic transport properties improve by increasing donor-acceptor coupling factor.

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Section: A Transmission Probabilitysupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Direct Coupling on Electronic Transport and Thermoelectric Properties of Single Pyrene Molecule

Mutier¹,

Al-Badry²

2021

UTJsci

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“…W measures the AAH modulation strength, which is usually referred to as the correlated disorder strength, and b is an incommensurate quantity. In our analysis, we chose b = (1 + √ 5)/2 (golden mean) [13,69,70]. This typical value is widely used in the literature, though any other irrational number can also be considered, and the physics will remain unchanged.…”

Section: Non-hermitianmentioning

confidence: 99%

Localization Properties of a Quasiperiodic Ladder under Physical Gain and Loss: Tuning of Critical Points, Mixed-Phase Zone and Mobility Edge

et al. 2022

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We explore the localization properties of a double-stranded ladder within a tight-binding framework where the site energies of different lattice sites are distributed in the cosine form following the Aubry–André–Harper (AAH) model. An imaginary site energy, which can be positive or negative, referred to as physical gain or loss, is included in each of these lattice sites which makes the system a non-Hermitian (NH) one. Depending on the distribution of imaginary site energies, we obtain balanced and imbalanced NH ladders of different types, and for all these cases, we critically investigate localization phenomena. Each ladder can be decoupled into two effective one-dimensional (1D) chains which exhibit two distinct critical points of transition from metallic to insulating (MI) phase. Because of the existence of two distinct critical points, a mixed-phase (MP) zone emerges which yields the possibility of getting a mobility edge (ME). The conducting behaviors of different energy eigenstates are investigated in terms of inverse participation ratio (IPR). The critical points and thus the MP window can be selectively controlled by tuning the strength of the imaginary site energies which brings a new insight into the localization aspect. A brief discussion on phase transition considering a multi-stranded ladder was also given as a general case, to make the present communication a self-contained one. Our theoretical analysis can be utilized to investigate the localization phenomena in different kinds of simple and complex quasicrystals in the presence of physical gain and/or loss.

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“…Now, this spin-dependent transport [ 32 , 55 , 60 , 61 ] behavior can be tuned externally by modifying the characteristics of NM spacer and ferromagnetic layers. The site energies of the NM spacer is altered by cosine modulation following the AAH form [ 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 ], whereas the hopping parameter in ferromagnetic chains is rearranged by Floquet–Bloch anstaz [ 60 , 74 , 75 , 76 , 77 , 78 , 79 ] within a minimal coupling scheme due to light irradiation on them. The Hamiltonian of a layered nanojunction is constructed with the TB approximation [ 31 , 67 ] including only the contribution from the nearest-neighbor hopping (NNH) integral.…”

Section: Introductionmentioning

confidence: 99%

Possible Routes to Obtain Enhanced Magnetoresistance in a Driven Quantum Heterostructure with a Quasi-Periodic Spacer

et al. 2021

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In this work, we perform a numerical study of magnetoresistance in a one-dimensional quantum heterostructure, where the change in electrical resistance is measured between parallel and antiparallel configurations of magnetic layers. This layered structure also incorporates a non-magnetic spacer, subjected to quasi-periodic potentials, which is centrally clamped between two ferromagnetic layers. The efficiency of the magnetoresistance is further tuned by injecting unpolarized light on top of the two sided magnetic layers. Modulating the characteristic properties of different layers, the value of magnetoresistance can be enhanced significantly. The site energies of the spacer is modified through the well-known Aubry–André and Harper (AAH) potential, and the hopping parameter of magnetic layers is renormalized due to light irradiation. We describe the Hamiltonian of the layered structure within a tight-binding (TB) framework and investigate the transport properties through this nanojunction following Green’s function formalism. The Floquet–Bloch (FB) anstaz within the minimal coupling scheme is introduced to incorporate the effect of light irradiation in TB Hamiltonian. Several interesting features of magnetotransport properties are represented considering the interplay between cosine modulated site energies of the central region and the hopping integral of the magnetic regions that are subjected to light irradiation. Finally, the effect of temperature on magnetoresistance is also investigated to make the model more realistic and suitable for device designing. Our analysis is purely a numerical one, and it leads to some fundamental prescriptions of obtaining enhanced magnetoresistance in multilayered systems.

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Externally controlled high degree of spin polarization and spin inversion in a conducting junction: Two new approaches

Cited by 45 publications

References 60 publications

Effect of Direct Coupling on Electronic Transport and Thermoelectric Properties of Single Pyrene Molecule

Effect of Direct Coupling on Electronic Transport and Thermoelectric Properties of Single Pyrene Molecule

Localization Properties of a Quasiperiodic Ladder under Physical Gain and Loss: Tuning of Critical Points, Mixed-Phase Zone and Mobility Edge

Possible Routes to Obtain Enhanced Magnetoresistance in a Driven Quantum Heterostructure with a Quasi-Periodic Spacer

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