Details
| Original language | English |
|---|---|
| Article number | 195324 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 74 |
| Issue number | 19 |
| Publication status | Published - 20 Nov 2006 |
Abstract
Transport measurements of the activation gap at fractional filling factor 1/3 are compared to results of exact diagonalization, allowing identification of a small anti-skyrmion as the lowest excitation in the low-field regime. In agreement with theory, a crossover to spinless excitations at higher electron densities is observed. Two samples of different quality are investigated. A detailed description of the theoretical calculation of activation gaps is presented and features which should be taken into account are summarized: finite thickness, Landau level mixing, and comparison between different sizes of the model system and-whenever possible-also between different geometries (torus and sphere). Within the chosen model of disorder (entailing a single fit parameter) we obtain a good agreement between calculated energies and experimental results.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 74, No. 19, 195324, 20.11.2006.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Transport gap in a ν=1/3 quantum Hall system
T2 - A probe for skyrmions
AU - Dethlefsen, Annelene F.
AU - Haug, Rolf J.
AU - Výborný, Karel
AU - Čertík, Ondřej
AU - Wójs, Arkadiusz
PY - 2006/11/20
Y1 - 2006/11/20
N2 - Transport measurements of the activation gap at fractional filling factor 1/3 are compared to results of exact diagonalization, allowing identification of a small anti-skyrmion as the lowest excitation in the low-field regime. In agreement with theory, a crossover to spinless excitations at higher electron densities is observed. Two samples of different quality are investigated. A detailed description of the theoretical calculation of activation gaps is presented and features which should be taken into account are summarized: finite thickness, Landau level mixing, and comparison between different sizes of the model system and-whenever possible-also between different geometries (torus and sphere). Within the chosen model of disorder (entailing a single fit parameter) we obtain a good agreement between calculated energies and experimental results.
AB - Transport measurements of the activation gap at fractional filling factor 1/3 are compared to results of exact diagonalization, allowing identification of a small anti-skyrmion as the lowest excitation in the low-field regime. In agreement with theory, a crossover to spinless excitations at higher electron densities is observed. Two samples of different quality are investigated. A detailed description of the theoretical calculation of activation gaps is presented and features which should be taken into account are summarized: finite thickness, Landau level mixing, and comparison between different sizes of the model system and-whenever possible-also between different geometries (torus and sphere). Within the chosen model of disorder (entailing a single fit parameter) we obtain a good agreement between calculated energies and experimental results.
UR - http://www.scopus.com/inward/record.url?scp=33750976172&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.74.195324
DO - 10.1103/PhysRevB.74.195324
M3 - Article
AN - SCOPUS:33750976172
VL - 74
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 19
M1 - 195324
ER -