Orbital- and kz -Selective Hybridization of Se 4p and Ti 3d States in the Charge Density Wave Phase of TiSe2

Matthew D. Watson; Oliver J. Clark; Federico Mazzola; Igor Marković; Veronika Sunko; Timur K. Kim; Kai Rossnagel; Philip D.C. King

doi:10.1103/PhysRevLett.122.076404

Orbital- and kz -Selective Hybridization of Se 4p and Ti 3d States in the Charge Density Wave Phase of TiSe2

Matthew D. Watson, Oliver J. Clark, Federico Mazzola, Igor Marković, Veronika Sunko, Timur K. Kim, Kai Rossnagel, Philip D.C. King

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

We revisit the enduring problem of the 2×2×2 charge density wave (CDW) order in TiSe2, utilizing 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 hybridization 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.

Original language	English
Article number	076404
Journal	Physical Review Letters
Volume	122
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.122.076404
Publication status	Published - 22 Feb 2019

Bibliographical note

Funding Information:
We thank Andrew Hunter, Deepnarayan Biswas, Akhil Rajan, Kaycee Underwood, Kerstin Hanff, and Moritz Hoesch for technical support and useful discussions. We thank Diamond Light Source for access to Beamline I05 (Proposals No. SI19771-1, No. NT18555-1, and No. SI16262-1) that contributed to the results presented here. We gratefully acknowledge support from The Leverhulme Trust (Grants No. RL-2016-006 and No. PLP-2015-144) and The Royal Society. V. S. and O. J. C. acknowledge EPSRC for PhD studentship support through Grants No. EP/L015110/1 and No. EP/K503162/1. I. M. acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials.

Publisher Copyright:
© 2019 American Physical Society.

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.122.076404

Cite this

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title = "Orbital- and kz -Selective Hybridization of Se 4p and Ti 3d States in the Charge Density Wave Phase of TiSe2",

abstract = "We revisit the enduring problem of the 2×2×2 charge density wave (CDW) order in TiSe2, utilizing 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 hybridization 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.",

author = "Watson, {Matthew D.} and Clark, {Oliver J.} and Federico Mazzola and Igor Markovi{\'c} and Veronika Sunko and Kim, {Timur K.} and Kai Rossnagel and King, {Philip D.C.}",

note = "Funding Information: We thank Andrew Hunter, Deepnarayan Biswas, Akhil Rajan, Kaycee Underwood, Kerstin Hanff, and Moritz Hoesch for technical support and useful discussions. We thank Diamond Light Source for access to Beamline I05 (Proposals No. SI19771-1, No. NT18555-1, and No. SI16262-1) that contributed to the results presented here. We gratefully acknowledge support from The Leverhulme Trust (Grants No. RL-2016-006 and No. PLP-2015-144) and The Royal Society. V. S. and O. J. C. acknowledge EPSRC for PhD studentship support through Grants No. EP/L015110/1 and No. EP/K503162/1. I. M. acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

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AU - Clark, Oliver J.

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AU - Marković, Igor

AU - Sunko, Veronika

AU - Kim, Timur K.

AU - Rossnagel, Kai

AU - King, Philip D.C.

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N2 - We revisit the enduring problem of the 2×2×2 charge density wave (CDW) order in TiSe2, utilizing 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 hybridization 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.

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Orbital- and kz -Selective Hybridization of Se 4p and Ti 3d States in the Charge Density Wave Phase of TiSe2

Abstract

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