Single-atom gating and magnetic interactions in quantum corrals

Autor:	Anh T. Ngo, Sergio E. Ulloa, Eugene H. Kim
Rok vydání:	2017
Předmět:	Physics Spin states 02 engineering and technology Gating Electron Quantum entanglement 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Coupling (physics) 0103 physical sciences Atom 010306 general physics 0210 nano-technology Quantum Magnetic impurity
Zdroj:	Physical Review B. 95
ISSN:	2469-9969 2469-9950
DOI:	10.1103/physrevb.95.161407
Popis:	Single-atom gating, achieved by manipulation of adatoms on a surface, has been shown in experiments to allow precise control over superposition of electronic states in quantum corrals. Using a Green's function approach, we demonstrate theoretically that such atom gating can also be used to control the coupling between magnetic degrees of freedom in these systems. Atomic gating enables control not only on the direct interaction between magnetic adatoms, but also over superpositions of many-body states which can then control long distance interactions. We illustrate this effect by considering the competition between direct exchange between magnetic impurities and the Kondo screening mediated by the host electrons, and how this is affected by gating. These results suggest that both magnetic and nonmagnetic single-atom gating may be used to investigate magnetic impurity systems with tailored interactions, and may allow the control of entanglement of different spin states.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cc02ff681c515a2d5b2c29d27e517852 https://doi.org/10.1103/physrevb.95.161407 Zobrazit plný text záznamu