Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866916421430149120 |
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| author | Trocha, Piotr Siuda, Emil Weymann, Ireneusz |
| author_facet | Trocha, Piotr Siuda, Emil Weymann, Ireneusz |
| contents | Motivated by the experimental evidence of the Nagaoka ferromagnetism in quantum dot systems by Dehollain et al [1], we search for possible confirmation of such kind of ferromagnetism by analyzing the spin-resolved transport properties of a quadruple quantum dot system focusing on the linear response regime. In particular, we consider four quantum dots arranged in a two-by-two square lattice, coupled to external ferromagnetic source and drain electrodes. Turning on and off the specific conditions for the Nagaoka ferromagnetism to occur by changing the value of the intra-dot Coulomb interactions, we determine the transport coefficients, including the linear conductance, tunnel magnetoresistance and current spin polarization. We show that a sign change of the current spin polarization may be an indication of a ferromagnetic order of Nagaoka type which develops in the system. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_19444 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads Trocha, Piotr Siuda, Emil Weymann, Ireneusz Mesoscale and Nanoscale Physics Other Condensed Matter Motivated by the experimental evidence of the Nagaoka ferromagnetism in quantum dot systems by Dehollain et al [1], we search for possible confirmation of such kind of ferromagnetism by analyzing the spin-resolved transport properties of a quadruple quantum dot system focusing on the linear response regime. In particular, we consider four quantum dots arranged in a two-by-two square lattice, coupled to external ferromagnetic source and drain electrodes. Turning on and off the specific conditions for the Nagaoka ferromagnetism to occur by changing the value of the intra-dot Coulomb interactions, we determine the transport coefficients, including the linear conductance, tunnel magnetoresistance and current spin polarization. We show that a sign change of the current spin polarization may be an indication of a ferromagnetic order of Nagaoka type which develops in the system. |
| title | Spin-polarized transport in quadruple quantum dots attached to ferromagnetic leads |
| topic | Mesoscale and Nanoscale Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2409.19444 |