Exchange-driven bilayer-to-monolayer charge transfer in an asymmetric double-quantum-well

• Published in: Physica. E, Low-dimensional systems & nanostructures Vol. 12; no. 1; pp. 304 - 306
• Main Authors: Hamilton, A.R., Simmons, M.Y., Hanna, C.B., Dı́az-Vélez, J.C., Pepper, M., Ritchie, D.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2002
• Subjects: Bilayers; Double quantum wells; Magnetoresistance; Double quantum wells; Magnetoresistance; 73.40.−C; 73.20.Dx; Bilayers
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/S1386-9477(01)00351-4

We present data which shows for the first time that an exchange-driven bilayer-to-monolayer transition occurs in an externally biased double quantum well system at
B=0 as the total carrier density is
increased. This transition is due to the negative compressibility of the low density carrier systems and the layer imbalance caused by external gate biases.