Charge Imbalance and Bilayer 2D Electron Systems at $ν_T = 1$
| dc.creator | Champagne, A. R. | |
| dc.creator | Finck, A. D. K. | |
| dc.creator | Eisenstein, J. P. | |
| dc.creator | Pfeiffer, L. N. | |
| dc.creator | West, K. W. | |
| dc.date | 2008-08-08 | |
| dc.date | 2008-11-19 | |
| dc.date.accessioned | 2026-07-07T10:19:03Z | |
| dc.date.available | 2026-07-07T10:19:03Z | |
| dc.description | We use interlayer tunneling to study bilayer 2D electron systems at $ν_T = 1$ over a wide range of charge density imbalance, $Δν=ν_1-ν_2$, between the two layers. We find that the strongly enhanced tunneling associated with the coherent excitonic $ν_T = 1$ phase at small layer separation can survive at least up to an imbalance of $Δν$ = 0.5, i.e $(ν_1, ν_2)$ = (3/4, 1/4). Phase transitions between the excitonic $ν_T = 1$ state and bilayer states which lack significant interlayer correlations can be induced in three different ways: by increasing the effective interlayer spacing $d/\ell$, the temperature $T$, or the charge imbalance, $Δν$. We observe that close to the phase boundary the coherent $ν_T = 1$ phase can be absent at $Δν$ = 0, present at intermediate $Δν$, but then absent again at large $Δν$, thus indicating an intricate phase competition between it and incoherent quasi-independent layer states. At zero imbalance, the critical $d/\ell$ shifts linearly with temperature, while at $Δν$ = 1/3 the critical $d/\ell$ is only weakly dependent on $T$. At $Δν$ = 1/3 we report the first observation of a direct phase transition between the coherent excitonic $ν_T = 1$ bilayer integer quantum Hall phase and the pair of single layer fractional quantized Hall states at $ν_1$ = 2/3 and $ν_2=1/3$. | |
| dc.description | 13 pages, 8 postscript figures. Final published version | |
| dc.identifier | https://arxiv.org/abs/0808.1257 | |
| dc.identifier | http://arxiv.org/abs/0808.1257 | |
| dc.identifier | Phys. Rev. B 78, 205310 (2008) | |
| dc.identifier | doi:10.1103/PhysRevB.78.205310 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/174373 | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Charge Imbalance and Bilayer 2D Electron Systems at $ν_T = 1$ | |
| dc.type | text |