2D layered transport properties from topological insulator Bi2Se3 single crystals and micro flakes.
Low-field magnetotransport measurements of topological insulators such as Bi2Se3 are important for revealing the nature of topological surface states by quantum corrections to the conductivity, such as weak-antilocalization. Recently, a rich variety of high-field magnetotransport properties in the regime of high electron densities (∼10(19) cm(-3)) were reported, which can be related to additional two-dimensional layered conductivity, hampering the identification of the topological surface states. Here, we report that quantum corrections to the electronic conduction are dominated by the surface states for a semiconducting case, which can be analyzed by the Hikami-Larkin-Nagaoka model for two coupled surfaces in the case of strong spin-orbit interaction. However, in the metallic-like case this analysis fails and additional two-dimensional contributions need to be accounted for. Shubnikov-de Haas oscillations and quantized Hall resistance prove as strong indications for the two-dimensional layered metallic behavior. Temperature-dependent magnetotransport properties of high-quality Bi2Se3 single crystalline exfoliated macro and micro flakes are combined with high resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy, confirming the structure and stoichiometry. Angle-resolved photoemission spectroscopy proves a single-Dirac-cone surface state and a well-defined bulk band gap in topological insulating state. Spatially resolved core-level photoelectron microscopy demonstrates the surface stability.
Novel Materials Group, Humboldt-Universität zu Berlin, Newtonstraβe 15, 12489 Berlin, Germany.
Olivio
O
Chiatti
Novel Materials Group, Humboldt-Universität zu Berlin, Newtonstraβe 15, 12489 Berlin, Germany.
Christian
C
Riha
Novel Materials Group, Humboldt-Universität zu Berlin, Newtonstraβe 15, 12489 Berlin, Germany.
Dominic
D
Lawrenz
Novel Materials Group, Humboldt-Universität zu Berlin, Newtonstraβe 15, 12489 Berlin, Germany.
Marco
M
Busch
Novel Materials Group, Humboldt-Universität zu Berlin, Newtonstraβe 15, 12489 Berlin, Germany.
Srujana
S
Dusari
Helmholtz-Zentrum-Berlin für Materialien und Energie, Albert-Einstein-Straβe 15, 12489 Berlin, Germany.
Jaime
J
Sánchez-Barriga
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straβe 4, 12489 Berlin, Germany.
Anna
A
Mogilatenko
Department of Chemistry, Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia.
Lada V
LV
Yashina
Helmholtz-Zentrum-Berlin für Materialien und Energie, Albert-Einstein-Straβe 15, 12489 Berlin, Germany.
Sergio
S
Valencia
Helmholtz-Zentrum-Berlin für Materialien und Energie, Albert-Einstein-Straβe 15, 12489 Berlin, Germany.
Akin A
AA
Ünal
Helmholtz-Zentrum-Berlin für Materialien und Energie, Albert-Einstein-Straβe 15, 12489 Berlin, Germany.
Oliver
O
Rader
Novel Materials Group, Humboldt-Universität zu Berlin, Newtonstraβe 15, 12489 Berlin, Germany.
Saskia F
SF
Fischer