title: Dot-ring nanostructure: Rigorous analysis of many-electron effects.
abstract: We discuss the quantum dot-ring nanostructure (DRN) as canonical example of a nanosystem, for which the interelectronic interactions can be evaluated exactly. The system has been selected due to its tunability, i.e., its electron wave functions can be modified much easier than in, e.g., quantum dots. We determine many-particle states for Ne = 2 and 3 electrons and calculate the 3- and 4-state interaction parameters, and discuss their importance. For that purpose, we combine the first- and second-quantization schemes and hence are able to single out the component single-particle contributions to the resultant many-particle state. The method provides both the ground- and the first-excited-state energies, as the exact diagonalization of the many-particle Hamiltonian is carried out. DRN provides one of the few examples for which one can determine theoretically all interaction microscopic parameters to a high accuracy. Thus the evolution of the single-particle vs. many-particle contributions to each state and its energy can be determined and tested with the increasing system size. In this manner, we contribute to the wave-function engineering with the interactions included for those few-electron systems.
authors.affiliation: Akademickie Centrum Materiałów i Nanotechnologii, AGH Akademia Górniczo-Hutnicza, Al. Mickiewicza 30, PL-30-059 Kraków, Poland.
authors.forename: Andrzej
authors.initials: A
authors.lastname: Biborski
authors.affiliation: Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagielloński, ul. Łojasiewicza 11, PL-30-348 Kraków, Poland.
authors.forename: Andrzej P
authors.initials: AP
authors.lastname: Kądzielawa
authors.affiliation: Instytut Fizyki, Uniwersytet Śląski, ul. Uniwersytecka 4, PL-40-007 Katowice, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Gorczyca-Goraj
authors.affiliation: Instytut Fizyki, Uniwersytet Śląski, ul. Uniwersytecka 4, PL-40-007 Katowice, Poland.
authors.forename: Elżbieta
authors.initials: E
authors.lastname: Zipper
authors.affiliation: Instytut Fizyki, Uniwersytet Śląski, ul. Uniwersytecka 4, PL-40-007 Katowice, Poland.
authors.forename: Maciej M
authors.initials: MM
authors.lastname: Maśka
authors.affiliation: Akademickie Centrum Materiałów i Nanotechnologii, AGH Akademia Górniczo-Hutnicza, Al. Mickiewicza 30, PL-30-059 Kraków, Poland.|Instytut Fizyki im. Mariana Smoluchowskiego, Uniwersytet Jagielloński, ul. Łojasiewicza 11, PL-30-348 Kraków, Poland.
authors.forename: Józef
authors.initials: J
authors.lastname: Spałek