Experimental Progress towards Probing the Ground State of an Electron-Hole Bilayer by Low-Temperature Transport
Experimental Progress towards Probing the Ground State of an Electron-Hole Bilayer by Low-Temperature Transport
复制标题
低温输运探测电子-空穴双层基态的实验进展
DOI:
10.1155/2011/727958
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发表时间:
2011
影响因子:
1.5
通讯作者:
Das Gupta K
中科院分区:
文献类型:
--
作者:
Das Gupta K
Recently, it has been possible to design independently contacted electron‐hole bilayers (EHBLs) with carrier densities <5 × 1010cm2in each layer and a separation of 10–20 nm in a GaAs/AlGaAs system. In these EHBLs, the interlayer interaction can be stronger than the intralayer interactions. Theoretical works have indicated the possibility of a very rich phase diagram in EHBLs consisting of excitonic superfluid phases, charge density waves, and Wigner crystals. Experiments have revealed that the Coulomb drag on the hole layer shows strong nonmonotonic deviations from a~T2behaviour expected for Fermi‐liquids at low temperatures. Simultaneously, an unexpected insulating behaviour in the single‐layer resistances (at a highly “metallic” regime withkFl> 500) also appears in both layers despite electron mobilities of above ~106cm2V−1s−1and hole mobilities over ~105cm2V−1s−1. Experimental data also indicates that the point of equal densities (n=p) is not special.
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