Title: Bulk and surface electronic states in the dosed semimetallic HfTe2
Other Titles: Objemové a povrchové elektronické stavy v dopovaném polokovu HfTe2
Authors: El Youbi, Zakariae
Jung, Sung Won
Mukherjee, Saumya
Fanciulli, Mauro
Schusser, Jakub
Heckmann, Olivier
Richter, Christine
Minár, Jan
Hricovini, Karol
Watson, Matthew D.
Cacho, Cephise
Citation: EL YOUBI, Z., JUNG, SW., MUKHERJEE, S., FANCIULLI, M., SCHUSSER, J., HECKMANN, O., RICHTER, CH., MINÁR, J., HRICOVINI, K., WATSON, MD., CACHO, C. Bulk and surface electronic states in the dosed semimetallic HfTe2. Physical Review B, 2020, roč. 101, č. 23. ISSN 2469-9950.
Issue Date: 2020
Publisher: American Physical Society
Document type: článek
URI: http://hdl.handle.net/11025/39624
ISSN: 2469-9950
Keywords: fotoemise;elektron;dichalkogenidy
Keywords in different language: photoemission;electron;dichalcogenides
Abstract: Článek se zabývá popisem elektronové struktury dopovaného polokovu HfTe2 doplněnou o teoretické výpočty.
Abstract in different language: 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-HfTe2, 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 kz 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 EF, 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.
Rights: © American Physical Society
Appears in Collections:Články / Articles (RAM)

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