期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 42, 期 4, 页码 1247-1250出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2009.11.093
关键词
Electron-hole bilayer; Coulomb drag; Charge density wave; Exciton
资金
- EPSRC [EP/D008506/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D008506/1] Funding Source: researchfish
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.
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