| Zugriffsnummer | 18490 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Universal conductance and conductivity at critical points in integer quantum Hall systems |
| Autor(in); Institution |
Schweitzer, Ludwig; Q.2, Theoretische Grundlagen, PTB-Braunschweig
Markoš, Peter; Slovak Academy of Sciences, Institute of Physics, Bratislava, SLOVAKIA
|
| Quelle/Jahr | Physical Review Letters: 95 (2005), 256805-1 - 256805-4 |
| ISSN | 0031-9007 |
| DOI | |
| Verlag | Ridge, NY: APS |
| Klassifikationscode | PACS: 73.43.Nq ; PACS: 71.30.+h ; PACS: 72.15.Rn |
| Zusammenfassung | The sample averaged longitudinal two-terminal conductance and the respective Kubo conductivity are calculated at quantum critical points in the integer quantum Hall regime. In the limit of large system size, both transport quantities are found to be the same within numerical uncertainty in the lowest Landau band, 0.60 ± 0.02 e2/h and 0.58 ± 0.03e2/h, respectively. In the second-lowest Landau band, a critical conductance 0.61 ± 0.03e2/h is obtained which indeed supports the notion of universality. However, these numbers are significantly at variance with the hitherto commonly believed value ½e2/h. We argue that this difference is due to the multifractal structure of critical wave functions, a property that should generically show up in the conductance at quantum critical points. |
