  We propose a model for a molecular motor in a molecular electronic junction
driven by a natural manifestation of Landauer's blowtorch effect. The effect
emerges via the interplay of the electronic friction and diffusion
coefficients, each calculated quantum mechanically using nonequilibrium Green's
functions, within a semi-classical Langevin description of the rotational
dynamics. The motor functionality is analysed through numerical simulations
where the rotations exhibit a directional preference according to the intrinsic
geometry of the molecular configuration. The proposed mechanism for motor
function is expected to be ubiquitous for a range of molecular geometries
beyond the one examined here.
