In-situ Angle-Resolved Photoelectron Spectroscopy through the Metal-Insulator Transition in (LaMnO$_{3}$)$_{2n}$(SrMnO$_{3}$)$_{n}$ Superlattices

We report in-situ Angle-Resolved Photoelectron Spectroscopy (ARPES) studies of (LaMnO$_{3}$)$_{2n}$(SrMnO$_{3}$)$_{n}$ superlattices. Our combined Molecular Beam Epitaxy and ARPES system permits the growth and measurement of (LaMnO$_{3}$)$_{2n}$(SrMnO$_{3}$)$_{n}$ under ultra-high vacuum conditions, permitting high-resolution ARPES to be performed on these materials for the first time. Superlattices of this form exhibit a variety of electronic states as a function of ``n'' and temperature, including a transition from metallic to insulating behaviour for n $<$ 3 to n $\ge$ 3. We present ARPES measurements of the Fermi surface and remnant Fermi surface for metallic and insulating superlattices, and discuss the suppression of spectral weight at the Fermi level across the metal-insulator transition. We have directly observed band-mass renormalization in high-resolution ARPES data on metallic samples, and will discuss the implications to interactions with collective modes.