Yu-Wen Lee, Yu-Li Lee, Chung-Hou Chung
We investigate the noise correlations in a quantum point contact of helical edge states far away from the quantum critical point at finite bias by perturbative calculations. The results reveal the effects of the two-particle scattering processes on the electrical transport, which depend on the Luttinger liquid parameter. Moreover, the Fano factors for the auto- and corss-correlations of the currents are distinct from the ones for tunneling between the chiral edge states in the quantum Hall liquid.
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http://arxiv.org/abs/1207.5080
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