Controlled single-spin transport in thermally driven molecular devices containing graphene electrodes modulated by quantum resonance
| Autor: | Zhang Jing, Xufen Wang, H. L. Yu, Liu Yushen, Xifeng Yang, X. L. Zou, Yaojun Dong |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | Resonance effects play an important role in the transport properties of low-dimensional systems. Here, we investigate the thermally driven spin-transport properties of ruthenium-terpyridine molecular devices, where the molecule is linked to graphene electrodes by the carbon atomic chains from two sides. The results show that an odd-even oscillating behavior of the transmission spectra and a perfect spin-filtering effect at the Fermi level are observed in the ruthenium-terpyridine molecular devices. Furthermore, the negative differential thermoelectric resistance more easily appears in the long even-numbered carbon atomic chains, and the sign of the thermally driven single-spin current can be tuned via the temperature. Such a behavior is attributed to the competition between the Breit-Wigner and Fano resonances in the vicinity of the Fermi level for the contributions of the thermally driven current. In brief, here we present an alternative to control the thermally driven single-spin current in molecular devices via quantum effect. |
| Databáze: | OpenAIRE |
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