Tunable Collective Excitations in Epitaxial Perovskite Nickelates
arxiv(2024)
摘要
The formation of plasmons through the collective excitation of charge density
has generated intense discussions, offering insights to fundamental sciences
and potential applications. While the underlying physical principles have been
well-established, the effects of multibody interactions and orbital
hybridization on plasmonic dynamics remain understudied. In this work, we
present the observation of conventional metallic and correlated plasmons in
epitaxial La1-xSrxNiO3 (LSNO) films with varying Sr doping concentrations (x =
0, 0.125, 0.25), unveiling their intriguing evolution. Unlike samples at other
doping concentrations, the x = 0.125 intermediate doping sample does not
exhibit the correlated plasmons despite showing high optical conductivity.
Through experimental investigation using spectroscopic ellipsometry and X-ray
absorption spectroscopy, that is further supported by theoretical calculations,
the O2p-Ni3d orbital hybridization for x = 0.125 is found to be significantly
enhanced, alongside a considerable weakening of its effective correlation U*.
These factors account for the absence of correlated plasmons and the high
optical conductivity observed in LSNO (0.125). Our findings highlight the
significant impact of orbital hybridization on the electronic structures and
the formation of quasiparticles in strongly correlated systems, thereby marking
a notable advancement in plasmonics, emphasizing LSNO's compelling potential as
a substitute material in optoelectronic devices.
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