Phonon and magnon jets above the critical current in nanowires with planar domain walls
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866909104015933440 |
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| author | Stamenova, Maria Stamenov, Plamen Todorov, Tchavdar |
| author_facet | Stamenova, Maria Stamenov, Plamen Todorov, Tchavdar |
| contents | We show through non-equilibrium non-adiabatic electron-spin-lattice simulations that above a critical current in magnetic atomic wires with a narrow domain wall (DW), a couple of atomic spaces in width, the electron flow triggers violent stimulated emission of phonons and magnons with an almost complete conversion of the incident electron momentum flux into a phonon and magnon flux. Just below the critical levels of the current flow, the DW achieves maximal velocity of about $3\times 10^{4}$ m/s, entering a strongly non-adiabatic regime of DW propagation, followed by a breakdown at higher biases. Above this threshold a further increase of the current with the applied bias is impossible -- the electronic current suffers a heavy suppression and the DW stops. This poses a fundamental limit to the current densities attainable in atomic wires. At the same time it opens up an exciting way of generating the alternative quasi-particle currents, described above, once the requisite electronic-structure properties are met. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_12879 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Phonon and magnon jets above the critical current in nanowires with planar domain walls Stamenova, Maria Stamenov, Plamen Todorov, Tchavdar Mesoscale and Nanoscale Physics We show through non-equilibrium non-adiabatic electron-spin-lattice simulations that above a critical current in magnetic atomic wires with a narrow domain wall (DW), a couple of atomic spaces in width, the electron flow triggers violent stimulated emission of phonons and magnons with an almost complete conversion of the incident electron momentum flux into a phonon and magnon flux. Just below the critical levels of the current flow, the DW achieves maximal velocity of about $3\times 10^{4}$ m/s, entering a strongly non-adiabatic regime of DW propagation, followed by a breakdown at higher biases. Above this threshold a further increase of the current with the applied bias is impossible -- the electronic current suffers a heavy suppression and the DW stops. This poses a fundamental limit to the current densities attainable in atomic wires. At the same time it opens up an exciting way of generating the alternative quasi-particle currents, described above, once the requisite electronic-structure properties are met. |
| title | Phonon and magnon jets above the critical current in nanowires with planar domain walls |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2303.12879 |