Width-Tuned Magnetic Order Oscillation on Zigzag Edges of Honeycomb Nanoribbons

Chen, Wenchao; Zhou, Yuan; Yu, Shuling; Yin, Wei‐Guo; Gong, Chang‐De

doi:10.1021/acs.nanolett.7b01474

Cited by 27 publications

(31 citation statements)

References 32 publications

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“…It is worth further investigating the possible magnetic phase transition under different conditions with the Hubbard model. Similar phase transitions in zigzag GNRs have been studied in the recent theoretical and experimental works [36][37][38]. With the shift of the chemical potential, the magnetism of the band structures are proposed to be changed [36].…”

Section: Introductionmentioning

confidence: 53%

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Topological and magnetic phase transition in silicene-like zigzag nanoribbons

Xie

2018

New J. Phys.

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Spin-orbital interactions (SOI) in silicene results in the quantum-spin-Hall effect, while the Hubbard-induced Coulomb interaction in zigzag nanoribbons often generates a band gap with the anti-ferromagnetic (AF) spin orders on two edges. In this paper we systematically study these two joint contributions to the zigzag silicene-like nanoribbons (zSiNR). Some topological and magnetic phase transitions are investigated with different material parameters and external fields. We find when the ribbon width or the SOI value exceeds some critical value, the SOI may overcome the Coulomb interaction and the system transits from a band insulator to a topological insulator: the quantumspin-Hall or the spin quantum-anomalous Hall state. We also find some magnetic phase transition exists in the Hubbard-dominated zSiNR systems when the exchange field or the electric field goes beyond some critical values. Lastly we observe a double topological/magnetic phase transition in a Hubbard-SOI-balanced zSiNR system before the magnetic and topological phases are destroyed by a strong electric field. OPEN ACCESS RECEIVED

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Section: Introductionmentioning

confidence: 53%

“…In this transition the AF state changes into the FM state due to the change of self-consisted chemical potential. Furthermore, the magnetism on the GNR edges is found to oscillate when increasing the ribbon width [38].…”

Section: Introductionmentioning

confidence: 96%

Topological and magnetic phase transition in silicene-like zigzag nanoribbons

Xie

2018

New J. Phys.

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“…As shown for graphene in [9] (experiment and theory), as well as in [19] (theory), a typical situation is that narrow zigzag nanoribbons initially have the AF configuration, which gives way to the F configuration for increasing width.…”

Section: B Electrical Conductance and Edge Magnetism Of Graphene Andmentioning

confidence: 96%

Selected graphenelike zigzag nanoribbons with chemically functionalized edges: Implications for electronic and magnetic properties

Krompiewski

2019

Phys. Rev. B

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It is known that there is a wide class of quasi 2-dimensional graphenelike nanomaterials which in many respects can outperform graphene. So, here in addition to graphene, the attention is directed to stanene (buckled honeycomb structure) and phosphorene (puckered honeycomb structure). It is shown that, depending on the doping, these materials can have magnetically ordered edges. Computed diagrams of magnetic phases illustrate that, on the one hand, n-type doped narrow zigzag nanoribbons of graphene and stanene have antiferromagnetically aligned magnetic moments between the edges. On the other hand, however, in case of phosphorene nanoribbons the zigzag edges can have ferromagnetically aligned magnetic moments for the p-type doping. The edge magnetism critically influences transport properties of the nanoribbons, and if adequately controlled can make them attractive for spintronics. PACS numbers: 72.25.-b, 75.75.-c, 72.80.Vp; 85.75.-d arXiv:1910.00301v1 [cond-mat.mes-hall]

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“…However, a ZGNR-based spin-caloritronics device requires ferromagnetic ZGNRs, at least as long as leads extend over the full width of the ribbon. Consequently, a strong external magnetic field [81], doping, or width engineering [84] are needed to stabilize a ferromagnetic state. From this point of view, the hexagonal-ZGNF junction proposed here has a big advantage over the ZGNRs [30,85,86], and also armchair silicene nanoribbons [87] for spin-caloritronic applications.…”

Section: Spin-resolved Current In Hexagonal Zgnfsmentioning

confidence: 99%

Spin-caloritronic transport in hexagonal graphene nanoflakes

Phùng,

Peters,

Honecker

et al. 2020

Preprint

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We investigate the spin-dependent thermoelectric effect of graphene flakes with magnetic edges in the ballistic regime. Employing static respectively dynamic mean-field theory (DMFT) and the Landauer formalism in the framework of the non-equilibrium Green's function method, we calculate the spin and charge currents in magnetic hexagonal graphene flakes by varying the temperature of the junction for different flake sizes. While in non-magnetic gated graphene the temperature gradient drives a charge current, we observe a significant spin current for hexagonal graphene flakes with magnetic zigzag edges. Specifically, we show that in the "meta" configuration of a hexagonal flake subject to weak Coulomb interactions, a pure spin current can be driven just by a temperature gradient in a temperature range that is promising for device applications. Bigger flakes are found to yield a bigger window of Coulomb interactions where such spin currents arise, and larger values of the current.

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Width-Tuned Magnetic Order Oscillation on Zigzag Edges of Honeycomb Nanoribbons

Cited by 27 publications

References 32 publications

Topological and magnetic phase transition in silicene-like zigzag nanoribbons

Topological and magnetic phase transition in silicene-like zigzag nanoribbons

Selected graphenelike zigzag nanoribbons with chemically functionalized edges: Implications for electronic and magnetic properties

Spin-caloritronic transport in hexagonal graphene nanoflakes

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