Non-fermi-liquid behavior in transport through co-doped Au Chains
We calculate the conductance as a function of temperature G ( T ) through Au monatomic chains containing one Co atom as a magnetic impurity, and connected to two conducting leads with a fourfold symmetry axis. Using the information derived from ab initio calculations, we construct an effective model...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2013 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/21170 |
| Acceso en línea: | http://hdl.handle.net/11336/21170 |
| Access Level: | acceso abierto |
| Palabra clave: | Kondo physics Numerical Renormalization Group ab initio electronic structure Atomic chains https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | We calculate the conductance as a function of temperature G ( T ) through Au monatomic chains containing one Co atom as a magnetic impurity, and connected to two conducting leads with a fourfold symmetry axis. Using the information derived from ab initio calculations, we construct an effective model ˆ H eff that hybridizes a 3 d 7 quadruplet at the Co site with two 3 d 8 triplets through the hopping of 5 d x z and 5 d y z electrons of Au. The quadruplet is split by spin anisotropy due to spin-orbit coupling. Solving ˆ H eff with the numerical renormalization group we find that at low temperatures G ( T ) = a − b √ T and the ground state impurity entropy is ln ( 2 ) / 2 , a behavior similar to the two-channel Kondo model. Stretching the chain leads to a non-Kondo phase, with the physics of the underscreened Kondo model at the quantum critical point. |
|---|