Unveiling the Semimetallic Nature of 1$T$-TiSe$_2$ by Doping its Charge Density Wave
- Jaouen, Thomas Université de Fribourg
- Rumo, Maxime Université de Fribourg
- Hildebrand, Baptiste Université de Fribourg
- Mottas, Marie-Laure Université de Fribourg
- Nicholson, Christopher W. Université de Fribourg
- Kremer, Geoffroy Université de Fribourg
- Salzmann, Björn Université de Fribourg
- Vanini, Fabiano Université de Fribourg
- Barreteau, C. Université de Genève
- Giannini, E. Université de Genève
- Beck, Hans-Peter Université de Fribourg
- Aebi, Philipp Université de Fribourg
- Monney, Claude Université de Fribourg
-
2019
9
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$_2$.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
-
- English
- Classification
- Physics
- Other electronic version
- License
- License undefined
- Identifiers
-
- RERO DOC 330882
- Persistent URL
- https://folia.unifr.ch/unifr/documents/309589
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