Epitaxial growth and electronic structure of Ruddlesden-Popper nickelates (${\mathrm{L}\mathrm{a}}_{n+1}{\mathrm{N}\mathrm{i}}_n{\mathrm{O}}_{3n+1},n=1-5$)

We report the epitaxial growth of Ruddlesden-Popper nickelates, ${\mathrm{L}\mathrm{a}}_{n+1}{\mathrm{N}\mathrm{i}}_n{\mathrm{O}}_{3n+1}$, with $n$ up to 5 by reactive molecular beam epitaxy (MBE). X-ray diffractions indicate high crystalline quality of these films and transport measurements show strong dependence on the $n$ values. Angle-resolved photoemission spectroscopy (ARPES) reveals the electronic structure of ${\mathrm{L}\mathrm{a}}_5{\mathrm{N}\mathrm{i}}_4{\mathrm{O}}_{13}$, showing a large hole-like pocket centered around the Brillouin zone corner with a $(\pi ,\pi )$ back-folded copy.