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Topological Surface State of Bi 2 Se 3 Modified by Adsorption of Organic Donor Molecule Tetrathianaphthacene
Author(s) -
Kitazawa Tatsuya,
Yaji Koichiro,
Shimozawa Kosuke,
Kondo Hiroshi,
Yamanaka Takayoshi,
Yaguchi Hiroshi,
Ishida Yukiaki,
Kuroda Kenta,
Harasawa Ayumi,
Iwahashi Takashi,
Ouchi Yukio,
Komori Fumio,
Shin Shik,
Kanai Kaname
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202000524
Subject(s) - angle resolved photoemission spectroscopy , x ray photoelectron spectroscopy , materials science , photoemission spectroscopy , fermi level , topological insulator , inverse photoemission spectroscopy , molecule , chemical physics , electronic structure , band bending , topology (electrical circuits) , work function , ultraviolet photoelectron spectroscopy , nanotechnology , electron , condensed matter physics , optoelectronics , physics , chemistry , nuclear magnetic resonance , organic chemistry , mathematics , quantum mechanics , combinatorics , layer (electronics)
Topological insulators (TIs) are expected to realize new spintronic devices with low dissipative electrical transport. Organic molecule/TI interfaces have been investigated to explore the potential of multifunctional organic molecules for TI devices. However, there is no unified understanding of the interfacial electronic structure. The electronic structure of the molecular side must be examined to fully understand the phenomena at the interface. Thus, this paper reports the investigation of the interface between the electron‐donating organic molecule tetrathianaphthacene (TTN) and prototypical TI Bi 2 Se 3 by ultraviolet photoemission spectroscopy (UPS), X‐ray photoemission spectroscopy (XPS), and angle‐resolved photoemission spectroscopy (ARPES). The deformation of the Fermi surface of the topological surface states as well as the formation of a 2D electron gas state (2DEG) at the interface occurs upon TTN deposition onto Bi 2 Se 3 . Confinement of the 2DEG into the surface arises from band‐bending accompanied by electron donation from TTNs to Bi 2 Se 3 according to XPS and UPS. The knowledge obtained in this work shed new light on the understanding of the electronic structure of organic molecules/TI interfaces and open the door to the TI applications via modification by electronic functional organic molecules.