Abstract
Employing a two-orbital extended Peierls–Hubbard model, we demonstrate the photomanipulation of mixed-valent states in platinum-halide ladder compounds. There are two types of interchain valence arrangements, namely in-phase and out-of-phase types. The conversion of the in-phase structure to the out-of-phase structure is induced by photoirradiation, which is accelerated with increasing light intensity, while the reverse process hardly occurs. The out-of-phase arrangement is highly stabilized in the photoexcited states by the interchain electron transfer.
Highlights
We investigate the competition between in phase (IP) CDW and OP CDW in the ground and photoexcited states with particular emphasis on the effects of the lattice geometry
We focus on the IP-CDW and OP-CDW ground states in the vicinity of the phase boundaries, and reveal whether and how IP CDW and OP CDW are manipulated by photoirradiation
We have investigated photomanipulation of the IP-CDW and OP-CDW states in platinum-halide
Summary
We can tune the electronic structures by replacing constituent metals, halogens, and ligands Applying pressure is another way of controlling electronic properties [13,14,15]. In the diplatinum-halide chain compounds [16,17,18], the pressure-induced phase transition between the charge-density-wave (CDW) state [· · · X − −Pt3+ Pt3+. The platinum-halide ladder compound, which consists of two PtX chains connected with each other by interchain ligands (Figure 1), is a good model compound for the study of the interplay between photoinduced electron–phonon dynamics and lattice geometry. Valence-alternating ground states [27,28], where the interchain arrangement is in phase (IP) in the μ-bpym compounds, whereas it is out of phase (OP) in the bpy compounds These competing CDWs can be optically distinguished from each other.
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