Towards the ground state of an electron-hole bilayer

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