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Three-dimensional (3D) simulations of electron beams propagating in highenergy density (HED) plasmas using the quasi-static Particle-in-Cell (PIC) codeQuickPIC demonstrate a significant increase in stopping power when beamelectrons mutually interact via their wakes. Each beam electron excites aplasma wave wake of wavelength $\sim2\pi c/\omega_{pe}$, where $c$ is the speedof light and $\omega_{pe}$ is the background plasma frequency. We show that adiscrete collection of electrons undergoes a beam-plasma like instabilitycaused by mutual particle-wake interactions that causes electrons to bunch inthe beam, even for beam densities $n_b$ for which fluid theory breaks down.This bunching enhances the beam's stopping power, which we call "correlatedstopping," and the effect increases with the "correlation number" $N_b \equivn_b (c/\omega_{pe})^3$. For example, a beam of monoenergetic 9.7 MeV electronswith $N_b=1/8$, in a cold background plasma with $n_e=10^{26}$ cm$^{-3}$ (450 gcm$^{-3}$ DT), has a stopping power of $2.28\pm0.04$ times the single-electronvalue, which increases to $1220\pm5$ for $N_b=64$. The beam also experiencestransverse filamentation, which eventually limits the stopping enhancement.

Stopping Power Enhancement From Discrete Particle-Wake Correlations in High Energy Density Plasmas