Ehlen, N., Sanna, A., Senkovskiy, B. V., Petaccia, L., Fedorov, A. V., Profeta, G. and Grüneis, A. (2018). Direct observation of a surface resonance state and surface band inversion control in black phosphorus. Physical review B, 97 (4). 045143. APS Physics. ISSN 2469-9969

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Abstract

We report a Cs-doping-induced band inversion and the direct observation of a surface resonance state with an elliptical Fermi surface in black phosphorus (BP) using angle-resolved photoemission spectroscopy. By selectively inducing a higher electron concentration (1.7 × 1014 cm−2) in the topmost layer, the changes in the Coulomb potential are sufficiently large to cause surface band inversion between the parabolic valence band of BP and a parabolic surface state around the point of the BP Brillouin zone. Tight-binding calculations reveal that band gap openings at the crossing points in the two high-symmetry directions of the Brillouin zone require out-of-plane hopping and breaking of the glide mirror symmetry. Ab initio calculations are in very good agreement with the experiment if a stacking fault on the BP surface is taken into account. The demonstrated level of control over the band structure suggests the potential application of few-layer phosphorene in topological field-effect transistors.

Item Type: Journal Article
Creators:
CreatorsEmailORCID
Ehlen, N.UNSPECIFIEDUNSPECIFIED
Sanna, A.UNSPECIFIEDUNSPECIFIED
Senkovskiy, B. V.UNSPECIFIEDUNSPECIFIED
Petaccia, L.UNSPECIFIEDUNSPECIFIED
Fedorov, A. V.UNSPECIFIEDUNSPECIFIED
Profeta, G.UNSPECIFIEDUNSPECIFIED
Grüneis, A.UNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-81649
DOI: 10.1103/PhysRevB.97.045143
Journal or Publication Title: Physical review B
Publisher: APS Physics
ISSN: 2469-9969
Volume: 97
Number: 4
Subjects: Natural sciences and mathematics
Physics
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Institute of Physics II
Language: English
Date: 24 January 2018
Funders: ERC Grant No. 648589 “SUPER-2D”, DFG project CRC 1238, e European Community’s Seventh Framework Programme (FP7/2007- 2013) under Grant Agreement No. 312284 (CALIPSO)
Refereed: Yes
Page Range: 045143
URI: http://kups.ub.uni-koeln.de/id/eprint/8164

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