posted on 2022-12-27, 20:07authored byErik Kirstein, Evgeny A. Zhukov, Dmitri R. Yakovlev, Nataliia E. Kopteva, Carolin Harkort, Dennis Kudlacik, Oleh Hordiichuk, Maksym V. Kovalenko, Manfred Bayer
The versatile potential of lead halide perovskites and
two-dimensional
materials is merged in the Ruddlesden–Popper perovskites having
outstanding optical properties. Here, the coherent spin dynamics in
Ruddlesden–Popper (PEA)2PbI4 perovskites
is investigated by picosecond pump–probe Kerr rotation in an
external magnetic field. The Larmor spin precession of resident electrons
with a spin dephasing time of 190 ps is identified. The longitudinal
spin relaxation time in weak magnetic fields measured by the spin
inertia method is as long as 25 μs. A significant anisotropy
of the electron g-factor with the in-plane value
of +2.45 and out-of-plane value of +2.05 is found. The exciton out-of-plane g-factor of +1.6 is measured by magneto-reflectivity. This
work contributes to the understanding of the spin-dependent properties
of two-dimensional perovskites and their spin dynamics.