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We demonstrate optical sideband spectroscopy of a single $^9$Be$^+$ ion in acryogenic 5 Tesla Penning trap using two-photon stimulated-Raman transitionsbetween the two Zeeman sublevels of the $1s^{2}2s$ ground state manifold. Byapplying two complementary coupling schemes, we accurately measure Ramanresonances with and without contributions from motional sidebands. From thelatter we obtain an axial sideband spectrum with an effective mode temperatureof (3.1 $\pm$ 0.4)~mK. This results are a key step for quantum logic operationsin Pennings traps, applicable to high precision matter-antimatter comparisonstests in the baryonic sector of the standard model.

Optical stimulated-Raman sideband spectroscopy of a single $^9$Be$^+$ ion in a Penning trap