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A new topological insulator built from quasi one-dimensional atomic ribbons

DOI: 10.1002/pssr.201409518 DOI Help

Authors: Piet Schönherr (University of Oxford) , Shilei Zhang (University of Oxford) , Yuanqian Liu (University of Oxford) , Patryk Kusch (Freie Universität Berlin) , Stephanie Reich (Freie Universität Berlin) , Dominik Daisenberger (Diamond Light Source) , Dharmalingam Prabhakaran (University of Oxford) , Yulin Chen (University of Oxford) , Thorsten Hesjedal (University of Oxford, Diamond Light Source) , Terence Giles (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physica Status Solidi (rrl) - Rapid Research Letters , VOL 9 , PAGES 130 - 135

State: Published (Approved)
Published: February 2015
Diamond Proposal Number(s): 8608

Abstract: A novel topological insulator with orthorhombic crystal structure is demonstrated. It is characterized by quasi one-dimensional, conducting atomic chains instead of the layered, two-dimensional sheets known from the established Bi2(Se,Te)3 system. The Sb-doped Bi2Se3 nanowires are grown in a TiO2-catalyzed process by chemical vapor deposition. The binary Bi2Se3 is transformed from rhombohedral to orthorhombic by substituting Sb on ∼38% of the Bi sites. Pure Sb2Se3 is a topologically trivial band insulator with an orthorhombic crystal structure at ambient conditions, and it is known to transform into a topological insulator at high pressure. Angle-resolved photoemission spectroscopy shows a topological surface state, while Sb doping also tunes the Fermi level to reside in the bandgap. (© 2015 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)

Journal Keywords: topological insulators;angle-resolved photoemission spectroscopy;nanowires;(Bi,Sb)2Se3;orthorhombic structure

Subject Areas: Physics

Instruments: I15-Extreme Conditions