6533b823fe1ef96bd127ebe8
RESEARCH PRODUCT
Rotational and vibrational spectra of quantum rings
M. KoskinenStephanie ReimannM. ManninenB. Mottelsonsubject
PhysicsElectron densityStrongly Correlated Electrons (cond-mat.str-el)Condensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsFOS: Physical sciencesElectronSpectral lineCondensed Matter - Strongly Correlated ElectronsMesoscale and Nanoscale Physics (cond-mat.mes-hall)Atomic physicsHigh electronQuantumVibrational spectradescription
One can confine the two-dimensional electron gas in semiconductor heterostructures electrostatically or by etching techniques such that a small electron island is formed. These man-made ``artificial atoms'' provide the experimental realization of a text-book example of many-particle physics: a finite number of quantum particles in a trap. Much effort was spent on making such "quantum dots" smaller and going from the mesoscopic to the quantum regime. Far-reaching analogies to the physics of atoms, nuclei or metal clusters were obvious from the very beginning: The concepts of shell structure and Hund's rules were found to apply -- just as in real atoms! In this Letter, we report the discovery that electrons confined in ring-shaped quantum dots form rather rigid molecules with antiferromagnetic order in the ground state. This can be seen best from an analysis of the rotational and vibrational excitations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-04-06 |