  $\gamma$-jet production is considered one of the best probes of the hot
quark-gluon plasma in high-energy heavy-ion collisions since the direct
$\gamma$ can be used to gauge the initial energy and momentum of the associated
jet. This is investigated within the Linear Boltzmann Transport (LBT) model for
jet propagation and jet-induced medium excitation. With both parton energy loss
and medium response from jet-medium interaction included, LBT can describe
experimental data well on $\gamma$-jet correlation in Pb+Pb collisions at the
Large Hadron Collider. Multiple jets associated with direct $\gamma$ production
are found to contribute significantly to $\gamma$-jet correlation at small
$p_T^{\rm jet}<p_T^\gamma$ and large azimuthal angle relative to the opposite
direction of $\gamma$. Jet medium interaction not only suppresses the leading
jet at large $p_T^{\rm jet}$ but also sub-leading jets at large azimuthal
angle. This effectively leads to the narrowing of $\gamma$-jet correlation in
azimuthal angle instead of broadening due to jet-medium interaction. The
$\gamma$-jet profile on the other hand will be broadened due to jet-medium
interaction and jet-induced medium response. Energy flow measurements relative
to the direct photon is illustrated to reflect well the broadening and
jet-induced medium response.
