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Bulk and surface electronic states in the dosed semimetallic HfTe 2

DOI: 10.1103/PhysRevB.101.235431 DOI Help

Authors: Zakariae El Youbi (Diamond Light Source; CY Cergy-Paris Université) , Sungwon Jung (Diamond Light Source) , Saumya Mukherjee (Diamond Light Source; University of Oxford) , Mauro Fanciulli (CY Cergy-Paris Université; Université Paris-Saclay, CEA, CNRS) , Jakub Schusser (CY Cergy-Paris Université; University of West Bohemia) , Olivier Heckmann (CY Cergy-Paris Université; Université Paris-Saclay, CEA, CNRS) , Christine Richter (CY Cergy-Paris Université; Université Paris-Saclay, CEA, CNRS) , Jan Minar (University of West Bohemia) , Karol Hricovini (CY Cergy-Paris Université; Université Paris-Saclay, CEA, CNRS) , Matthew D. Watson (Diamond Light Source) , Cephise Cacho (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 101

State: Published (Approved)
Published: June 2020
Diamond Proposal Number(s): 24921

Open Access Open Access

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.

Subject Areas: Physics, Materials

Instruments: I05-ARPES

Added On: 22/06/2020 10:37


Discipline Tags:

Materials Science Physics Hard condensed matter - structures

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)