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Towards the ground state of an electron-hole bilayer

Croxall, AF; Das Gupta, K; Nicoll, CA; Farrer, I; Beere, HE; Ritchie, DA; Pepper, M; (2010) Towards the ground state of an electron-hole bilayer. In: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES. (pp. 1247 - 1250). ELSEVIER SCIENCE BV

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Transport measurements down to 50 mK have been performed on independently contacted electron-hole bilayers (EHBL) with a 10 nm barrier, close to the excitonic Bohr radius of the system (similar to 12 nm). Coulomb drag measured reveals a departure from that expected for two Fermi liquids, exhibiting an upturn that may be followed by a downturn or even a sign-reversal at the lowest temperatures. Concurrently an insulating state in the single-layer resistivities has been found for low sheet resistances (p << h/e(2)), well away from where the metal-insulator transition has been previously observed in two-dimensional systems. We can unambiguously show that this insulating state is caused by the interlayer interaction, as opposed to disorder. We consider the possibility of excitonic and collective mode driven phases that have been anticipated in EHBLs. (c) 2009 Elsevier B.V. All rights reserved.

Type:Proceedings paper
Title:Towards the ground state of an electron-hole bilayer
Event:18th International Conference on Electronic Properties of Two-Dimensional Systems
Location:Kobe, JAPAN
Dates:2009-07-19 - 2009-07-24
Keywords:Electron-hole bilayer, Coulomb drag, Charge density wave, Exciton, CHARGE-DENSITY WAVES, COULOMB DRAG, TRANSPORT, SYSTEMS, LAYERS
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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