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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Bulk and surface electronic states in the dosed semimetallic HfTe 2 Zakariae El Youbi , Sungwon Jung , Saumya Mukherjee , Mauro Fanciulli , Jakub Schusser , Olivier Heckmann , Christine Richter , Jan Minar , Karol Hricovini , Matthew D. Watson , Cephise Cacho Physical Review B 101 DOI: 10.1103/PhysRevB.101.235431 Diamond Proposal Number(s): [24921] Open Access Show Abstract ▼ Abstract: The dosing of layered materials with alkali metals has become a commonly used strategy in ARPES experiments. However, precisely what occurs under such conditions, both structurally and electronically, has remained a matter of debate. Here we perform a systematic study of 1T- HfTe 2 , a prototypical semimetal of the transition metal dichalcogenide family. By utilizing photon energy-dependent angle-resolved photoemission spectroscopy (ARPES), we have investigated the electronic structure of this material as a function of potassium (K) deposition. From the k z maps, we observe the appearance of 2D dispersive bands after electron dosing, with an increasing sharpness of the bands, consistent with the wave-function confinement at the topmost layer. In our highest-dosing cases, a monolayerlike electronic structure emerges, presumably as a result of intercalation of the alkali metal. Here, by bringing the topmost valence band below E F , we can directly measure a band overlap of ∼ 0.2 eV. However, 3D bulklike states still contribute to the spectra even after considerable dosing. Our work provides a reference point for the increasingly popular studies of the alkali metal dosing of semimetals using ARPES.	Jun 2020

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I05-ARPES

Bulk and surface electronic states in the dosed semimetallic HfTe 2