Spin thermoelectric effects of new-style one-dimensional carbon-based nanomaterials

Yushen Liu; Jinfu Feng; Xuefeng Wang

doi:10.24294/can.v4i1.1323

Spin thermoelectric effects of new-style one-dimensional carbon-based nanomaterials

Yushen Liu, Jinfu Feng, Xuefeng Wang

Article ID: 1323
Vol 4, Issue 1, 2021

VIEWS - 826 (Abstract) 189 (PDF)

Abstract

Based on first-principles methods, the authors of this paper investigate spin thermoelectric effects of one-dimensional spin-based devices consisting of zigzag-edged graphene nanoribbons (ZGNRs), carbon chains and graphene nanoflake. It is found that the spin-down transmission function is suppressed to zero, while the spin-up transmission function is about 0.25. Therefore, an ideal half-metallic property is achieved. In addition, the phonon thermal conductance is obviously smaller than the electronic thermal conductance. Meantime, the spin Seebeck effects are obviously enhanced at the low-temperature regime (about 80K), resulting in the fact that spin thermoelectric figure of merit can reach about 40. Moreover, the spin thermoelectric figure of merit is always larger than the corresponding charge thermoelectric figure of merit. Therefore, the study shows that they can be used to prepare the ideal thermospin devices.

Keywords

Graphene Nanoribbons; Carbon Chains; Graphene Nanoflake; Spin Seebeck Coefficients; Thermoelectric Figure of Merit

Full Text:

PDF

References

1. Novoselov KS, Geim AK, Morozov SV. Electric field effect in atomically thin carbon films. Science 2004; 306: 666–669.

2. Son Y, Cohen ML, Louie SG. Energy gaps in graphene nanoribbons. Physical Review Letters 2007; 98(8).

3. Xu C, Luo G, Liu Q, et al. Giant magnetoresistance in silicene nanoribbons. Nanoscale 2012; 4: 3111–3117.

4. Son Y, Cohen M L, Louie SG. Half-metallic graphene nanoribbons. Nature 2006; 444: 347.

5. Wu T, Wang X, Zhai M, et al. Negativedifferential spin conductance in doped zigzag graphenenanoribbons. Applied Physical Letters 2012; 100(5): 2112.

6. Maunárriz J, Gaul C, Malyshev AV, et al. Strong spin-dependent negative differential resistance in composite graphene superlattices. Physical Review B Condensed Matter 2012; 88(15): 5423.

7. Jiang C, Wang X, Zhai M. Spin negative differential resistance in edge doped zigzag graphene nanoribbons. Carbon an International Journal Sponsored by the American Carbon Society 2014; 68: 406.

8. Uchida K, Takahashi S, Harii K, et al. Observation of the spin Seebeck effect. Nature 2008; 455: 778.

9. Dubi Y, Di Ventra M. Thermo-spin effects in a quantum dot connected to ferromagnetic leads. Physical Review B Condensed Matter 2009; 79(8): 1302(R).

10. Jaworski C M, Yang J, Mack S, et al. Observation of spin-Seebeck effect in a ferromagnetic semiconductor. Nature Mater 2010; 9: 898.

11. Uchida K, Adachi H, et al. Long-range spin Seebeck effect and acoustic spin pumping. Nature Mater 2011; 10: 737.

12. Adachi H, Ohe J, Takahashi S, et al. Linear-response theory of spin Seebeck effect in ferromagnetic insulators. Physical Review B 2011; 83(9): 4410.

13. Dubi Y, Di Ventra M. Colloquium: Heat flow and thermoelectricity in atomic and molecular junctions. Review of Modern Physics 2011; 83: 131.

14. Liu Y, Chi F, Yang X, et al. Pure spin thermoelectric generator based on a rashba quantum dot molecule. Journal of Applied Physics 2011; 109(5): 3712.

15. Liu Y, Yang X, Chi F, et al. A proposal for time-dependent pure-spin-current generators. Applied Physics Letters 2012; 101(21): 3109.

16. Liu Y, Wang X, Chi F. Non-magnetic doping induced a high spin-filter efficiency and large spin Seebeck effect in zigzag graphene nanoribbons. Journal of Materials Chemistry C 2013; 2013(1): 3756–3776.

17. Yang X, Liu Y, Zhang X, et al. Perfect spin filtering and large spin thermoelectric effects in organic transition-metal molecular junctions. Physical Chemistry Chemical Physics Cambridge Royal Society of Chemistry 2014; 16: 11349–11357.

18. Liu Y, Zhang X, Wang X, et al. Spin-resolved Fano resonances induced large spin Seebeck effects in grapheme carbon-chain junctions. Applied Physics Letters 2014; 104(24): 2412.

19. Yang X, Liu Y, Wang X, et al. Large spin Seebeck effects in zigzag-edge silicene nanoribbons. Aip Advances 2014; 4(8): 7116.

20. Yang X, Zhang X, Hong X, et al. Temperature-controlled giant thermal magnetoresistance behaviors in doped zigzagedged silicene nanoribbons. Rsc Advances 2014; 4: 48539–48546.

21. Yang X, Zhou W, Hong X, et al. Half-metallic properties, single-spin negative differential resistance, and large singlespin Seebeck effects induced by chemical doping in zigzag-edged graphene nanoribbons. The Journal of Chemical Physics 2015; 142(2): 4706.

22. Jin C, Lan H, Peng L, et al. Deriving carbon atomic chains from graphene. Physical Review Letters 2009; 102(20): 5501.

23. Shen L, Zeng M, Yang S, et al. Electron transport properties of atomic carbon nanowires between graphene electrodes. Journal of the American Chemical Society 2010; 132: 11481–11486.

24. Dong Y, Wang X, Zhai M, et al. Half-metallicity in aluminum-doped zigzag silicene nanoribbons. The Journal of Physical Chemistry C 2013; 117(37): 18845–18850.

25. Kobayashi K, Aikawa H, Katsumoto S, et al. Tuning of the Fano effect through a quantum dot in an Aharonov-bohm Interferometer. Physics Review Letters 2002; 88: 256806.

26. Liu Y, Yang X. Enhancement of thermoelectric efficiency in a double-quantum-dot molecular junction. Journal of Applied Physics 2010; 108(2): 3710.

27. Taylor T, Guo H, Wang J. Ab initio modeling of quantum transport properties of molecular electronic devices. Physical Review B 2001; 63(24): 5407.

28. Brandbyge M, Mozos JL, Ordejon P, et al. Density-functional method for non-equilibrium electron transport. Physical Review B, Condensed Matter 2002; 65(16): 5401.

29. Yang X, Liu Y. Pure spin current in a double quantum dot device generated by thermal. Journal of Applied Physics 2013; 113(16): 4310.

DOI: https://doi.org/10.24294/can.v4i1.1323