Indications for sharp continuous phase transitions at finite temperatures connected with the apparent metal-insulator transition in two-dimensional disordered systems
| dc.creator | Mobius, A. | |
| dc.date | 2007-12-06 | |
| dc.date | 2008-05-05 | |
| dc.date.accessioned | 2026-07-07T09:39:32Z | |
| dc.date.available | 2026-07-07T09:39:32Z | |
| dc.description | In a recent experiment, Lai et al. [Phys. Rev. B 75, 033314 (2007)] studied the apparent metal-insulator transition (MIT) of a Si quantum well structure tuning the charge carrier concentration $n$. They observed linear temperature dependences of the conductivity $σ(T,n)$ around the Fermi temperature and found that the corresponding $T \to 0$ extrapolation $σ_0(n)$ exhibits a sharp bend just at the MIT. Here, reconsidering the data published by Lai et al., it is shown that this sharp bend is related to a peculiarity of $σ(T=const.,n)$ clearly detectable in the whole $T$ range up to 4 K, the highest measuring temperature in that work. Since this peculiarity seems not to be smoothed out with increasing $T$ it may indicate a sharp continuous phase transition between the regions of apparent metallic and activated conduction to be present at finite temperature. Hints from the literature of such a behavior are discussed. Finally, a scaling analysis illuminates similarities to previous experiments and provides understanding of the shape of the peculiarity and of sharp peaks found in $d log_{10} σ/ d n (n)$. | |
| dc.description | Revised version (quantitative determination of exponent beta added), accepted for publication by Physical Review B. Revtex, 10 pages, 9 figures | |
| dc.identifier | https://arxiv.org/abs/0712.0992 | |
| dc.identifier | http://arxiv.org/abs/0712.0992 | |
| dc.identifier | Phys. Rev. B 77, 205317 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.205317 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/161203 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Indications for sharp continuous phase transitions at finite temperatures connected with the apparent metal-insulator transition in two-dimensional disordered systems | |
| dc.type | text |