We analyze the local level occupation of a spinless, interacting two-level quantum dot coupled to two leads by means of Wilson's numerical renormalization group method. A gate voltage sweep, causing a rearrangement of the charge such that the system's energy is minimized, leads to oscillations, and sometimes even inversions, in the level occupations. We find that these oscillations, qualitatively understandable by a simple Hartree analysis, are generic and occur in a wide range of system parameters. By allowing a relative sign in one tunneling matrix element between dot and leads, we extend our findings to more generic models. Experimental applications and the qualitative effect of spin are discussed.
|Titolo:||Charge oscillations in quantum dots: Renormalization group and Hartree method calculations|
|Autori:||Sindel, M.; Silva, A.; Oreg, Y.; von Delft, J.|
|Rivista:||PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||10.1103/PhysRevB.72.125316|
|Appare nelle tipologie:||1.1 Journal article|