A. D. K. Finck, J. P. Eisenstein, L. N. Pfeiffer, K. W. West
Published 2010-12-19, updated 2011-06-06Version 2
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.
Comments: 4+ pages, 4 figures. Revised version as accepted for publication in Physical Review Letters
Journal: Phys. Rev. Lett. 106, 236807 (2011)
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