A molecular state of correlated electrons in a quantum dot

Details A molecular state of correlated electrons in a quantum dot A molecular state of correlated electrons in a quantum dot

2009-02-12

arxiv.org/abs/0902.2130v1

Nature Physics 4, 467 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

PDF file only; 24 pages, 7 figures, 2 table. Supplementary Information included

Scientific paper

10.1038/nphys944

Correlation among particles in finite quantum systems leads to complex behaviour and novel states of matter. One remarkable example is predicted to occur in a semiconductor quantum dot (QD) where at vanishing density the Coulomb correlation among electrons rigidly fixes their relative position as that of the nuclei in a molecule. In this limit, the neutral few-body excitations are roto-vibrations, which have either rigid-rotor or relative-motion character. In the weak-correlation regime, on the contrary, the Coriolis force mixes rotational and vibrational motions. Here we report evidence of roto-vibrational modes of an electron molecular state at densities for which electron localization is not yet fully achieved. We probe these collective modes by inelastic light scattering in QDs containing four electrons. Spectra of low-lying excitations associated to changes of the relative-motion wave function -the analogues of the vibration modes of a conventional molecule- do not depend on the rotational state represented by the total angular momentum. Theoretical simulations via the configuration-interaction (CI) method are in agreement with the observed roto-vibrational modes and indicate that such molecular excitations develop at the onset of short-range correlation.

Affiliated with

Also associated with

No associations

Rating

A molecular state of correlated electrons in a quantum dot does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A molecular state of correlated electrons in a quantum dot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A molecular state of correlated electrons in a quantum dot will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-556680