Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101659
Title: Anisotropic Two-Dimensional Screening at the Surface of Black Phosphorus
Authors: Kiraly, B.
Knol, E. J.
Volckaert, K.
Biswas, D.
Rudenko, A. N.
Prishchenko, D. A.
Mazurenko, V. G.
Katsnelson, M. I.
Hofmann, P.
Wegner, D.
Khajetoorians, A. A.
Issue Date: 2019
Publisher: American Physical Society
Citation: Anisotropic Two-Dimensional Screening at the Surface of Black Phosphorus / B. Kiraly, E. J. Knol, K. Volckaert, et al. — DOI 10.1103/PhysRevLett.123.216403 // Physical Review Letters. — 2019. — Vol. 123. — Iss. 21. — 216403.
Abstract: Electronic screening can have direct consequences for structural arrangements on the nanoscale, such as on the periodic ordering of adatoms on a surface. So far, such ordering phenomena have been explained in terms of isotropic screening of free electronlike systems. Here, we directly illustrate the structural consequences of anisotropic screening, making use of a highly anisotropic two-dimensional electron gas (2DEG) near the surface of black phosphorous. The presence of the 2DEG and its filling is controlled by adsorbed potassium atoms, which simultaneously serve to probe the electronic ordering. Using scanning tunneling microscopy, we show that the anisotropic screening leads to the formation of potassium chains with a well-defined orientation and spacing. We quantify the mean interaction potential utilizing statistical methods and find that the dimensionality and anisotropy of the screening is consistent with the presence of a band bending-induced 2DEG near the surface. The electronic dispersion of the 2DEG inferred by electronic ordering is consistent with that measured by angle-resolved photoemission spectroscopy. © 2019 American Physical Society.
Keywords: ANISOTROPY
PHOSPHORUS
PHOTOELECTRON SPECTROSCOPY
POTASSIUM
SCANNING TUNNELING MICROSCOPY
WELL SPACING
ANGLE RESOLVED PHOTOEMISSION SPECTROSCOPY
ELECTRONIC DISPERSIONS
ELECTRONIC ORDERING
ELECTRONIC SCREENING
INTERACTION POTENTIALS
ORDERING PHENOMENA
STRUCTURAL ARRANGEMENT
TWO-DIMENSIONAL ELECTRON GAS (2DEG)
TWO DIMENSIONAL ELECTRON GAS
URI: http://hdl.handle.net/10995/101659
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85075605173
PURE ID: 11347500
cc638295-97d8-4a78-98e4-bf9b0a3ff894
ISSN: 319007
DOI: 10.1103/PhysRevLett.123.216403
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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