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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Fermiology and electron-phonon coupling in the 2H and 3R polytypes of NbS Zakariae El Youbi , Sung Won Jung , Christine Richter , Karol Hricovini , Cephise Cacho , Matthew D. Watson Physical Review B 103 DOI: 10.1103/PhysRevB.103.155105 Diamond Proposal Number(s): [26443] Open Access Show Abstract ▼ Abstract: We investigate the electronic structure of the 2 H and 3 R polytypes of Nb S 2 . The Fermi surfaces measured by angle-resolved photoemission spectroscopy show a remarkable difference in size, reflecting a significantly increased band filling in 3 R − Nb 1 + x S 2 compared to 2 H − Nb S 2 , which we attribute to the presence of additional interstitial Nb, which act as electron donors. Thus, we find that the stoichiometry, rather than the stacking arrangement, is the most important factor in the difference in electronic and physical properties of the two phases. Our high resolution data on the 2 H phase shows kinks in the spectral function that are fingerprints of the electron-phonon coupling. However, the strength of the coupling is found to be much larger for the the sections of bands with Nb 4 d x 2 − y 2 , x y character than for the Nb 4 d 3 z 2 − r 2 . Our results provide an experimental framework for interpreting the two-gap superconductivity and latent charge density wave in 2 H − Nb S 2 .	Apr 2021
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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