Orbital- and kz-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe2
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We revisit the enduring problem of the 2 × 2 × 2 charge density wave (CDW) order in TiSe2, utilising photon energy-dependent angle-resolved photoemission spectroscopy to probe the full three-dimensional high- and low- temperature electronic structure. Our measurements demonstrate how a mismatch of dimensionality between the 3D conduction bands and the quasi-2D valence bands in this system leads to a hybridisation that is strongly kz-dependent. While such a momentum-selective coupling can provide the energy gain required to form the CDW, we show how additional “passenger” states remain, which couple only weakly to the CDW and thus dominate the low-energy physics in the ordered phase of TiSe2.
Watson , M D , Clark , O J , Mazzola , F , Markovic , I , Sunko , V , Kim , T K , Rossnagel , K & King , P D 2019 , ' Orbital- and k z -selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe 2 ' , Physical Review Letters , vol. 122 , no. 7 , 076404 . https://doi.org/10.1103/PhysRevLett.122.076404
Physical Review Letters
© 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.122.076404
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