  We experimentally demonstrate spatiotemporal steering of photoelectron
emission in multiphoton above-threshold single ionization of atoms exposed to a
phase-controlled orthogonally polarized two-color (OTC) laser pulse. Spatial
and energy resolved photoelectron angular distributions are measured as a
function of the laser phase, allowing us to look into the fine structures and
emission dynamics. The slow and fast photoelectrons, distinguished by the
energy larger or smaller than 2Up with Up being the ponderomotive energy of a
free electron in the laser field, have distinct spatiotemporal dependences of
the laser waveform. The phase-of-phase of the slow electron oscillates as
functions of both the energy and emission direction, however, the fast electron
present rather flat phase structure which merely depends on its emission
direction. Three-dimensional generalized quantum trajectory Monte Carlo
simulations are performed to explore the sub-cycle dynamics of the electron
emission in the phase-controlled OTC pulse.
