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Dissociation of indirect excitons: discontinuity and bistability in the tunnel current of 2D electron-hole layers
Parlangeli, A; Christianen, P C M; Geim, A K; Maan, J C; Fromhold, T M; Sheard, F W; Eaves, L; Main, P C; Henini, M
Physica E-Low-Dimensional Systems & Nanostructures. 2000;6(1-4):832-835.
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Abstract
We studied a novel bistability and discontinuity in the tunnel current of a 12 nm single-barrier GaAs/AlAs p-i-n heterostructure where a system of spatially separated electron and hole (e-h) layers is realized. Both features appear at T < 300 mK and when the in-plane e-e (h-h) distance is comparable to the inter-layer (e-h) onc. Whereas the high-current state (I-ICS) behaves normally and can be identified with the uncoupled e-h gases, the low-current state (LCS) shows some peculiarities: it has low current, a density 10% lower than the HCS at the same bias, a marked phase shift in the current magneto-oscillations (MO), and - contrary to the HCS - does not show any fractional feature. We identify the LCS with a gas of indirect excitons, the binding energy of which we estimate to be similar to 0.5 and similar to 5 meV at B = 0 and 10 T, respectively. We explain the bistability and the discontinuity as a first-order phase transition between a gas of excitons and the uncoupled 2D e-h gases. (C) 2000 Elsevier Science B.V. hll rights reserved.
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condensation; coupled quantum-wells; electron-hole correlations; excitons; heterostructures; quantum hall effect; tunneling
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