Direct observation of an electronic phase transition in a double quantum well
- 15 May 1992
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (19) , 11391-11394
- https://doi.org/10.1103/physrevb.45.11391
Abstract
We report in situ tuning of electron density through an electronic phase transition in a double quantum well. As density is increased, the well-formed quantum Hall state at energy-level filling factor ν=3 is replaced by a gapless correlated bilayer state. These observations establish that a phase transition exists which is driven by electron correlation (not, e.g., by the disorder potential). Activation energies in the transition region reveal a threshold density, above which the excitation gap decreases rapidly to zero.Keywords
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