Experimental observation of phase coherence in bilayer systems in the absence of a magnetic field |
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Authors: | Yu N Khanin E E Vdovin Yu V Dubrovskiĭ M Henini |
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Institution: | (1) Institute of Microelectronics Technology and High Purty Materials, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia;(2) The School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK |
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Abstract: | A high narrow peak of differential interlayer tunneling conductance is observed in the absence of a magnetic field at low temperatures in heterostructures with two closely spaced electron layers. The analysis of experimental results suggests that this peak is a consequence of the interlayer phase coherence, which arises in the system owing to the Bose condensation of interlayer excitons, i.e., pairs formed by electrons and holes belonging to different layers, in accordance with the recent theoretical predictions. |
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