Electrical control of the Kondo effect in a helical edge liquid
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2012
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| _version_ | 1866916152907661312 |
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| author | Eriksson, Erik Ström, Anders Sharma, Gargee Johannesson, Henrik |
| author_facet | Eriksson, Erik Ström, Anders Sharma, Gargee Johannesson, Henrik |
| contents | Magnetic impurities affect the transport properties of the helical edge states of quantum spin Hall insulators by causing single-electron backscattering. We study such a system in the presence of a Rashba spin-orbit interaction induced by an external electric field, showing that this can be used to control the Kondo temperature, as well as the correction to the conductance due to the impurity. Surprisingly, for a strongly anisotropic electron-impurity spin exchange, Kondo screening may get obstructed by the presence of a non-collinear spin interaction mediated by the Rashba coupling. This challenges the expectation that the Kondo effect is stable against time-reversal invariant perturbations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1207_3028 |
| institution | arXiv |
| publishDate | 2012 |
| record_format | arxiv |
| spellingShingle | Electrical control of the Kondo effect in a helical edge liquid Eriksson, Erik Ström, Anders Sharma, Gargee Johannesson, Henrik Mesoscale and Nanoscale Physics Strongly Correlated Electrons Magnetic impurities affect the transport properties of the helical edge states of quantum spin Hall insulators by causing single-electron backscattering. We study such a system in the presence of a Rashba spin-orbit interaction induced by an external electric field, showing that this can be used to control the Kondo temperature, as well as the correction to the conductance due to the impurity. Surprisingly, for a strongly anisotropic electron-impurity spin exchange, Kondo screening may get obstructed by the presence of a non-collinear spin interaction mediated by the Rashba coupling. This challenges the expectation that the Kondo effect is stable against time-reversal invariant perturbations. |
| title | Electrical control of the Kondo effect in a helical edge liquid |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/1207.3028 |