  Orbital current, defined as the orbital character of Bloch states in solids,
can ballistically travel with larger coherence length through a broader range
of materials than its spin counterpart, facilitating a robust, higher density
and energy efficient information transmission. Hence, active control of orbital
transport plays a pivotal role in propelling the progress of the evolving field
of quantum information technology. Unlike spin angular momentum, orbital
angular momentum (OAM), couples to phonon angular momentum (PAM) efficiently
via orbital-crystal momentum (L-k) coupling, giving us the opportunity to
control orbital transport through crystal field potential mediated angular
momentum transfer. Here, leveraging the orbital dependant efficient L-k
coupling, we have experimentally demonstrated the active control of orbital
current velocity using THz emission spectroscopy. Our findings include the
identification of a critical energy density required to overcome collisions in
orbital transport, enabling a swifter flow of orbital current. The capability
to actively control the ballistic orbital transport lays the groundwork for the
development of ultrafast devices capable of efficiently transmitting
information over extended distance.
