  The combined effect of Rashba and Dresselhaus spin-orbit interactions on the
physics of a helical Luttinger liquid coupled to a Kondo impurity is studied. A
Rashba coupling can potentially destroy the Kondo singlet formation in certain
parameter regimes [Phys. Rev. B 86, 161103(R) (2012)]. This effect is here
shown to vanish for sufficiently strong Dresselhaus interaction. The transport
properties of the system are investigated by calculating electrical
conductance, current and current fluctuations, and thermal conductance.
