  This is a theoretical study of electron transport in gated bilayer graphene -
a novel semiconducting material with a tunable band gap. It is shown that the
which-layer pseudospin coherence enhances the subgap conductivity and
facilitates the thermally activated transport. The mechanism proposed can also
lead to the non-monotonic conductivity vs. temperature dependence at a band gap
size of the order of 10 meV. The effect can be observed in gapped bilayer
graphene sandwiched in boron nitride where the electron-hole puddles and
flexural phonons are strongly suppressed.
