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Nano Lett. 2016 Jun 8;16(6):3409-14. doi: 10.1021/acs.nanolett.5b02635. Epub 2016 May 12.

Manipulating the Topological Interface by Molecular Adsorbates: Adsorption of Co-Phthalocyanine on Bi2Se3.

Author information

1
Laboratoire de Physique des Solides, CNRS, Universitè Paris-Sud, Université Paris-Saclay , 91405 Orsay Cedex, France.
2
Laboratory Micro & Nano-Carbon, Elettra - Sincrotrone Trieste S.C.p.A., s.s.14 Km 163.5, 34149 Trieste, Italy.
3
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
4
Dipartimento di Fisica, Università di Roma La Sapienza , Piazzale A. Moro 5, 00185 Roma, Italy.
5
Institut Néel, CNRS/UGA UPR2940, 25 Rue des Martyrs BP 166, 38042 Grenoble, France.
6
Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette Cedex, France.
7
Institute of Electronic Materials Technology, 01-919 Warsaw, Poland.
8
Laboratoire des Solides Irradiés, Ecole Polytechnique, CNRS, CEA, Université Paris-Saclay , 91128 Palaiseau Cedex, France.
9
Department of Physics, The City College of New York, CUNY , New York, New York 10031, United States.
10
Institute of Catalisys and Inorganic Chemistry, Institute of Physics, Azerbaijan National Academy of Sciences , AZ-1143, Baku, Azerbaijan.
11
Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastian, Spain.
12
Tomsk State University , 634050 Tomsk, Russia.
13
Department of Physics, University of Calabria , via ponte Bucci 31/C, 87036 Rende (CS), Italy.
14
Department of Materials Physics, University of the Basque Country UPV/EHU , 20018 Donostia-San Sebastian, Spain.
15
Centro de Fı́sica de Materiales (CFM), Materials Physics Center (MPC), Centro Mixto CSIC-UPV/EHU, 20018 Donostia-San Sebastian, Spain.
16
Saint Petersburg State University , 198504 Saint Petersburg, Russia.
17
Institute of Optical Materials and Technologies, "Acad. G. Bonchev" Str 109, Sofia, Bulgaria.
18
Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, s.s.14, Km 163.5, 34149 Trieste, Italy.
19
International Centre for Theoretical Physics, Strada Costiera 11, 34100 Trieste, Italy.
20
ICREA - Instituciò Catalana de Recerca i Estudis Avancast, Lluis Companys 23, 08010 Barcelona, Spain.

Abstract

Topological insulators are a promising class of materials for applications in the field of spintronics. New perspectives in this field can arise from interfacing metal-organic molecules with the topological insulator spin-momentum locked surface states, which can be perturbed enhancing or suppressing spintronics-relevant properties such as spin coherence. Here we show results from an angle-resolved photemission spectroscopy (ARPES) and scanning tunnelling microscopy (STM) study of the prototypical cobalt phthalocyanine (CoPc)/Bi2Se3 interface. We demonstrate that that the hybrid interface can act on the topological protection of the surface and bury the Dirac cone below the first quintuple layer.

KEYWORDS:

ARPES; Dirac cone; Topological insulator; charge transfer; phthalocyanine; surface states

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