Absorption Spectrum Around ν=1: Evidence for a Small-Size Skyrmion
Abstract
We measure the absorption spectrum of a two-dimensional electron system (2DES) in a GaAs quantum well in the presence of a perpendicular magnetic field. We focus on the absorption spectrum into the lowest Landau level around ν=1. We find that the spectrum consists of bound electron-hole complexes, trionlike and excitonlike. We show that their oscillator strength is a powerful probe of the 2DES spatial correlations. We find that near ν=1 the 2DES ground state consists of Skyrmions of small size (a few magnetic lengths).
- Publication:
-
Physical Review Letters
- Pub Date:
- August 2004
- DOI:
- arXiv:
- arXiv:cond-mat/0406756
- Bibcode:
- 2004PhRvL..93i6802G
- Keywords:
-
- 73.43.Lp;
- 71.35.Pq;
- 73.21.-b;
- 78.67.-n;
- Collective excitations;
- Charged excitons;
- Electron states and collective excitations in multilayers quantum wells mesoscopic and nanoscale systems;
- Optical properties of low-dimensional mesoscopic and nanoscale materials and structures;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- To be published in Phys Rev Lett. To be presented in ICSP2004, Flagstaff, Arizona. 4 figures (1 of them in color). 5 pages