Kondo transport in an anisotropic two-dimensional electron gas with quadratic momentum-dependent spin splitting
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866910253197557760 |
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| author | Parymuda, M. R. |
| author_facet | Parymuda, M. R. |
| contents | We investigate the transport properties of an anisotropic two-dimensional electron gas with a quadratic spin texture, described by a low-energy effective $ k\cdot p$ model, in the presence of $S=1/2$ Kondo impurities. We develop a Green's function framework that captures the interplay between the spin texture and the Kondo scattering for calculating transport properties in such systems. Using this framework, we evaluate the longitudinal resistivity corrections $Δρ^{xx}/ρ^{xx}_0$ and $Δρ^{yy}/ρ^{yy}_0$ to third order in the $s$-$d$ exchange coupling and analyze their temperature dependence. We further determine the Kondo temperature $T_K$ and show that it is strongly suppressed with increasing quadratic spin-splitting coupling $α$. In particular, we identify a critical coupling $α_{cr}$ marking the onset of a Kondo collapse, at which $T_K$ is reduced by approximately 37\% relative to that of the conventional two-dimensional electron gas. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26767 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Kondo transport in an anisotropic two-dimensional electron gas with quadratic momentum-dependent spin splitting Parymuda, M. R. Strongly Correlated Electrons We investigate the transport properties of an anisotropic two-dimensional electron gas with a quadratic spin texture, described by a low-energy effective $ k\cdot p$ model, in the presence of $S=1/2$ Kondo impurities. We develop a Green's function framework that captures the interplay between the spin texture and the Kondo scattering for calculating transport properties in such systems. Using this framework, we evaluate the longitudinal resistivity corrections $Δρ^{xx}/ρ^{xx}_0$ and $Δρ^{yy}/ρ^{yy}_0$ to third order in the $s$-$d$ exchange coupling and analyze their temperature dependence. We further determine the Kondo temperature $T_K$ and show that it is strongly suppressed with increasing quadratic spin-splitting coupling $α$. In particular, we identify a critical coupling $α_{cr}$ marking the onset of a Kondo collapse, at which $T_K$ is reduced by approximately 37\% relative to that of the conventional two-dimensional electron gas. |
| title | Kondo transport in an anisotropic two-dimensional electron gas with quadratic momentum-dependent spin splitting |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.26767 |