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The charge density wave (CDW) phase in 1$T$-TiSe$_2$ is investigated usingangle resolved photoemission spectroscopy (ARPES) and neutron scatteringmeasurements. Our ARPES results reveal a clear temperature dependence of thechemical potential of the system. They also demonstrate specific changesencountered by the Se 4$p$ valence and Ti 3$d$ conduction bands as thetemperature of the system is decreased through $T_{\text{CDW}}$. The valenceband undergoes a downward shift, whereas the conduction band remainsunaffected. The crystal structure in the CDW state shows a distinct split ofthe Ti-Se atomic correlations that are reminiscent of Jahn-Teller distortions,manifested in a breathing-type mode. The ARPES data together with the localstructure analysis support a direct link between Jahn-Teller-like distortionsand the CDW order in 1$T$-TiSe$_2$.

Evidence for breathing-type pseudo Jahn-Teller distortions in the charge density wave phase of 1$T$-TiSe$_2$