Self-doping instability of the Wigner-Mott insulator
| dc.creator | Pankov, S. | |
| dc.creator | Dobrosavljevic, V. | |
| dc.date | 2007-05-23 | |
| dc.date | 2008-02-15 | |
| dc.date.accessioned | 2026-07-07T09:20:37Z | |
| dc.date.available | 2026-07-07T09:20:37Z | |
| dc.description | We present a theory describing the mechanism for the two-dimensional (2D) metal-insulator transition (MIT) in absence of disorder. A two-band Hubbard model is introduced, describing vacancy-interstitial pair excitations within the Wigner crystal. Kinetic energy gained by delocalizing such excitations is found to lead to an instability of the insulator to self-doping above a critical carrier concentration $n=n_c$, mapping the problem to a density-driven Mott MIT. This mechanism provides a natural microscopic picture of several puzzling experimental features, including the large effective mass enhancement, the large resistivity drop, and the large positive magneto-resistance on the metallic side of the transition. We also present a global phase diagram for the clean 2D electron gas as a function of $n$ and parallel magnetic field $B_{\shortparallel}$, which agrees well with experimental findings in ultra clean samples. | |
| dc.description | 5 pages, 2 figures | |
| dc.identifier | https://arxiv.org/abs/0705.3428 | |
| dc.identifier | http://arxiv.org/abs/0705.3428 | |
| dc.identifier | Phys. Rev. B 77, 085104 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.77.085104 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/154780 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Self-doping instability of the Wigner-Mott insulator | |
| dc.type | text |