Jonathan M. Edge, Jian Li, Pierre Delplace, Markus Büttiker
We investigate the current noise correlations at a quantum point contact in a quantum spin Hall structure, focusing on the effect of a weak magnetic field in the presence of disorder. For the case of two equally biased terminals we discover a robust peak: the noise correlations vanish at $B = 0 $ and are negative for $B\not = 0 $. We find that the character of this peak is intimately related to the interplay between time reversal symmetry and the helical nature of the edge states and call it the $\Z_2 $ peak.
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http://arxiv.org/abs/1304.2656
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