Tunable half-metallic properties and spin Seebeck effects in zigzag-edged graphene nanoribbons adsorbed with V atom or V-benzene compound

Yang, Xifeng; Wang, H.L.; Hong, Xiaodong; Liu, Y.S.; Feng, Jian; Wang, X.F.; Zhang, Chang-wen; Chi, Feng; Si, Mingsu

doi:10.1016/j.orgel.2015.05.005

Cited by 8 publications

(3 citation statements)

References 49 publications

(49 reference statements)

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“…Pristine zig-zag graphene nanoribbons have intrinsic anti-ferromagnetic (AFM) coupling between the edges in the ground state. However, the spin state of the edge atoms can be tuned in a ferromagnetic (FM) configuration by applying a magnetic field [25]. In the FM configuration the zig-zag nanoribbons are metallic even in the case of very narrow widths, a high conductance being important for achieving a high figure of merit.…”

Section: Resultsmentioning

confidence: 99%

Ab Initio Investigations of Thermoelectric Effects in Graphene – Boron Nitride Nanoribbons

Visan

Nemneş

2016

EPJ Web of Conferences

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Abstract. Thermoelectric effects of graphene -hexagonal boron nitride (hBN) nanoribbons have been investigated by density functional theory (DFT) calculations. Pristine zig-zag nanoribbons are not suited to achieve high thermopower as the transmission function is flat around the chemical potential. By introducing hBN inclusions, the nanoribbon systems exhibit enhanced thermopower, due to the asymmetries introduced in the spin dependent transmission functions. Finite temperature differences between the two contacts are considered. The possibility of a good integration of hBN into graphene, makes the hybrid systems suitable for thermoelectric applications, which may be subject to further optimizations.

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Section: Resultsmentioning

confidence: 99%

Ab Initio Investigations of Thermoelectric Effects in Graphene – Boron Nitride Nanoribbons

Visan

Nemneş

2016

EPJ Web of Conferences

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“…For example, Zeng et al [3] indicated that a temperature discrepancy between the drain and the source could produce opposite spin currents in magnetized zigzag graphene nanoribbons (GNRs). Yang and colleagues verified the thermal spin transport features of zigzag-edged silicene nanoribbons (ZSiNRs) and demonstrated that they could have a huge thermal magnetoresistance and a high TSFE [23]. In our past studies, we utilized GNRs and silicene nanoribbons (SiNRs) with armchair or zigzag edges to construct spin caloritronics devices and realize marvelous thermal spin transport features such as SDSE [15,[24][25][26] and TSFE [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Metal-Free Magnetism and Spin-Dependent Seebeck Effect in Silicene Nanoribbons with Zigzag and Klein Edges

Tan

Jiang

et al. 2022

Advances in Condensed Matter Physics

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Nanoribbons based on low-dimensional materials are potential candidates for nanoscale spintronics devices. Here, some ferromagnetic silicene nanoribbons with zigzag and Klein edges (N-ZKSiNRs) are constructed. It is demonstrated that the N-ZKSiNRs with various widths (N) are placed in various spin-resolved electronic situations. With the increase of the width parameter N from 4 to 19, the N-ZKSiNRs pass from the indirect-gap bipolar magnetic semiconducting state (BMS) to the bipolar spin-gapless semiconductor (BSGS) and eventually to half-metallicity (HM). Moreover, applying a temperature gradient through the nanoribbons leads to spin-dependent current with the opposite flowing and spin orientations, demonstrating the spin-dependent Seebeck effect (SDSE). Besides, it was found that the BSGS phase is superior to the BMS and HM for generating SDSE. These findings confirm that the ZKSiNRs are promising choices for spin caloritronics devices.

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“…This leads to a nonzero energy gap and may remarkably enhances the Seebeck coefficient of silicene nanoribbons [27,28], which has inspired many researchers to search for exotic properties. For example, Yang et al studied the thermal spin transport properties of a zigzag-edged silicene nanoribbons (ZSiNRs) and found that the ZSiNRs can exhibit a giant thermal magnetoresistance and a high thermal spin-filter efficiency [29]. In our previous works, we proposed to use ZSiNR-based heterojunctions for the design of a spin-Seebeck diode (SSD) by driving thermal conduction electrons with opposite spin directions [30], and realized interesting thermal spin transport properties, such as spin thermoelectric rectification (TR), negative differential thermoelectric resistance (NDTR) and thermal colossal magneto-resistance effect [10].…”

Section: Introductionmentioning

confidence: 99%

Spin caloritronics in armchair silicene nanoribbons with sp ³ and sp ²-type alternating hybridizations

Tan

Liu

et al. 2018

J. Phys.: Condens. Matter

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Finite-layer nanoribbon materials have long been considered as potential candidates for nanodevices with novel quantum effects. Here we constructed a series of ferromagnetic armchair silicene nanoribbons (ASiNRs) with sp and sp-type alternating hybridizations, and found that the ASiNRs with different widths are localized in different spin-resolved electronic states. As the width parameter N is increased from 5 to 22, the ASiNR transits from indirect-gap half metallicity (HM), to indirect-gap spin semiconductor (SC), then to direct-gap SC and finally to direct-gap HM. When a temperature gradient is produced along the nanoribbons, the spin-dependent currents with the opposite flow directions are driven and a nearly perfect spin-dependent Seebeck effect (SDSE) occurs. Moreover, attributing to symmetrical spin-resolved transport channels, nearly pure thermal spin current without any accompanying charge current can be generated. In addition, for some ASiNRs with proper widths, both the thermal spin-up current and spin-down one are contributed by the electrons in energy valleys, resulting in a well-defined valley-dependent SDSE. These theoretical findings suggest that the ASiNRs with the sp and sp-type alternating hybridizations can be outstanding candidates for future spin caloritronic devices.

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Tunable half-metallic properties and spin Seebeck effects in zigzag-edged graphene nanoribbons adsorbed with V atom or V-benzene compound

Cited by 8 publications

References 49 publications

Ab Initio Investigations of Thermoelectric Effects in Graphene – Boron Nitride Nanoribbons

Ab Initio Investigations of Thermoelectric Effects in Graphene – Boron Nitride Nanoribbons

Computational Study of Metal-Free Magnetism and Spin-Dependent Seebeck Effect in Silicene Nanoribbons with Zigzag and Klein Edges

Spin caloritronics in armchair silicene nanoribbons with sp ³ and sp ²-type alternating hybridizations

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Tunable half-metallic properties and spin Seebeck effects in zigzag-edged graphene nanoribbons adsorbed with V atom or V-benzene compound

Cited by 8 publications

References 49 publications

Ab Initio Investigations of Thermoelectric Effects in Graphene – Boron Nitride Nanoribbons

Ab Initio Investigations of Thermoelectric Effects in Graphene – Boron Nitride Nanoribbons

Computational Study of Metal-Free Magnetism and Spin-Dependent Seebeck Effect in Silicene Nanoribbons with Zigzag and Klein Edges

Spin caloritronics in armchair silicene nanoribbons with sp 3 and sp 2-type alternating hybridizations

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Spin caloritronics in armchair silicene nanoribbons with sp ³ and sp ²-type alternating hybridizations