Universität zu Köln

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

Preview

PDF Direct_observation_of_a_surface_resonance_state_and_surface_band_inversion_control_in_black_phosphorus.pdf Download (4MB)

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:	Article
Creators:	Creators Email ORCID ORCID Put Code Ehlen, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanna, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Senkovskiy, B. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petaccia, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fedorov, A. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Profeta, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grüneis, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-81649
Identification Number:	10.1103/PhysRevB.97.045143
Journal or Publication Title:	Physical review B
Volume:	97
Number:	4
Page Range:	045143
Date:	24 January 2018
Publisher:	APS Physics
ISSN:	2469-9969
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	Natural sciences and mathematics Physics
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
URI:	http://kups.ub.uni-koeln.de/id/eprint/8164