Unveiling the Semimetallic Nature of 1$T$-TiSe$_2$ by Doping its Charge Density Wave
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Jaouen, Thomas
Université de Fribourg
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Rumo, Maxime
Université de Fribourg
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Hildebrand, Baptiste
Université de Fribourg
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Mottas, Marie-Laure
Université de Fribourg
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Nicholson, Christopher W.
Université de Fribourg
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Kremer, Geoffroy
Université de Fribourg
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Salzmann, Björn
Université de Fribourg
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Vanini, Fabiano
Université de Fribourg
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Barreteau, C.
Université de Genève
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Giannini, E.
Université de Genève
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Beck, Hans-Peter
Université de Fribourg
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Aebi, Philipp
Université de Fribourg
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Monney, Claude
Université de Fribourg
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English
The semimetallic or semiconducting nature of the transition metal dichalcogenide 1$T$-TiSe$_2$ remains under debate after many decades mainly due to the fluctuating nature of its 2 x 2 x 2 charge-density-wave (CDW) phase at room- temperature. In this letter, using angle-resolved photoemission spectroscopy, we unambiguously demonstrate that the 1$T$-TiSe$_2$ normal state is semimetallic with an electron-hole band overlap of ~110 meV by probing the low-energy electronic states of the perturbed CDWphase strongly doped by alkali atoms. Our study not only closes a long-standing debate but also supports the central role of the Fermi surface for driving the CDW and superconducting instabilities in 1$T$-TiSe$_2$.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
- Other electronic version
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Arxiv's version
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/309589
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