Orbital- and kz-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe2

Matthew David Watson; Oliver Jon Clark; Federico Mazzola; Igor Markovic; Veronika Sunko; Timur K. Kim; Kai Rossnagel; Philip David King

doi:10.1103/PhysRevLett.122.076404

Orbital- and k_z-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe₂

Matthew David Watson, Oliver Jon Clark, Federico Mazzola, Igor Markovic, Veronika Sunko, Timur K. Kim, Kai Rossnagel, Philip David King

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Abstract

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 k_z-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
Number of pages	6
Journal	Physical Review Letters
Volume	122
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.122.076404
Publication status	Published - 22 Feb 2019

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everTiSe2_bulkARPES_auth_accepted
© 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
Accepted author manuscript, 3.23 MB

Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures
King, P. (PI)
The Leverhulme Trust
1/08/17 → 31/07/22
Project: Standard
Philip Leverhulme Prize Award: Philip Leverhulme Prize Nomination
King, P. (PI)
The Leverhulme Trust
1/08/16 → 31/07/19
Project: Standard
CM DTC 2014 - 2022: EPSRC centre for doctoral training in condensed matter physics: Renewal of the CM-DTC
King, P. (PI)
EPSRC
1/08/14 → 31/01/24
Project: Standard

Orbital- and kz-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe2 (dataset)
Watson, M. D. (Creator), Clark, O. J. (Creator), Mazzola, F. (Creator), Markovic, I. (Creator), Sunko, V. (Creator), Kim, T. K. (Creator), Rossnagel, K. (Creator) & King, P. (Creator), University of St Andrews, 15 Jan 2019
DOI: 10.17630/5c9c3806-d8bf-4540-92c2-118ad69dd281
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title = "Orbital- and kz-selective hybridisation 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, 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.",

author = "Watson, {Matthew David} and Clark, {Oliver Jon} and Federico Mazzola and Igor Markovic and Veronika Sunko and Kim, {Timur K.} and Kai Rossnagel and King, {Philip David}",

year = "2019",

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doi = "10.1103/PhysRevLett.122.076404",

language = "English",

volume = "122",

journal = "Physical Review Letters",

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T1 - Orbital- and kz-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe2

AU - Watson, Matthew David

AU - Clark, Oliver Jon

AU - Mazzola, Federico

AU - Markovic, Igor

AU - Sunko, Veronika

AU - Kim, Timur K.

AU - Rossnagel, Kai

AU - King, Philip David

PY - 2019/2/22

Y1 - 2019/2/22

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.122.076404

DO - 10.1103/PhysRevLett.122.076404

M3 - Letter

SN - 0031-9007

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 076404

ER -

Orbital- and kz-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe2

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Projects

Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures

Philip Leverhulme Prize Award: Philip Leverhulme Prize Nomination

CM DTC 2014 - 2022: EPSRC centre for doctoral training in condensed matter physics: Renewal of the CM-DTC

Datasets

Orbital- and kz-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe2 (dataset)

Cite this

Orbital- and k_z-selective hybridisation of Se 4p and Ti 3d states in the charge density wave phase of TiSe₂