Spin polarization and heat generation matching in a quantum dot with magnetic background
| Autor: | Yonghong Yan, Shikuan Wang, Feng Jiang, Yanyan Zhu, Guangwei Zhai |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Spin polarization Phonon General Physics and Astronomy Insulator (electricity) 01 natural sciences Magnetic flux 010305 fluids & plasmas Quantum dot Heat generation 0103 physical sciences Thermoelectric effect Condensed Matter::Strongly Correlated Electrons 010306 general physics |
| Zdroj: | Physics Letters A. 393:127168 |
| ISSN: | 0375-9601 |
| DOI: | 10.1016/j.physleta.2021.127168 |
| Popis: | Motivated by the increasing demand for designing spin-polarized quantum devices via electric manipulation, we theoretically studied the spin polarization induced by Rashba spin-orbit interaction (RSOI) and the heat generated by thermal bias in the normal metal(N)-(insulator(I), Quantum Dot(QD))-Superconductor(S) ring threaded by a magnetic flux. We observed that the effective dot level, e ¯ d = 0 or e ¯ d = ± ω 0 2 ( ω 0 : characteristic phonon frequency), is responsible for the outstanding spin polarization in different BCS gaps and that non-dissipative spin-polarized current is produced effectively by adjusting the RSOI strength and thermal bias. Furthermore, we concluded that the thermal bias accounts for the spin-polarized Andreev current through the s-wave superconducting electrode, rather than the electric bias. Overall, our work provides a novel method for producing non-dissipative pure spin current. |
| Databáze: | OpenAIRE |
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