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Exciton Transport and Andreev Reflection in a Bilayer Quantum Hall System
Published 19 Dec 2010 in cond-mat.mes-hall and cond-mat.str-el | (1012.4220v2)
Abstract: We demonstrate that counterflowing electrical currents can move through the bulk of the excitonic quantized Hall phase found in bilayer two-dimensional electron systems (2DES) even as charged excitations cannot. These counterflowing currents are transported by neutral excitons which are emitted and absorbed at the inner and outer boundaries of an annular 2DES sample via an Andreev reflection process.
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