  We numerically study the electrical and thermoelectric transport properties
in phosphorene in the presence of both a magnetic field and disorder. The
quantized Hall conductivity is similar to that of a conventional
two-dimensional electron gas, but the positions of all the Hall plateaus shift
to the left due to the spectral asymmetry, in agreement with the experimental
observations. The thermoelectric conductivity and Nernst signal exhibit
remarkable anisotropy, and the thermopower is nearly isotropic. When a bias
voltage is applied between top and bottom layers of phosphorene, both
thermopower and Nernst signal are enhanced and their peak values become large.
