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Indentation fracture toughness of single-crystal Bi2Te3 topological insulators
Authors:Caterina Lamuta  Anna Cupolillo  Antonio Politano  Ziya S. Aliev  Mahammad B. Babanly  Evgueni V. Chulkov
Affiliation:1. Department of Mechanical, Energy and Management Engineering, University of Calabria, Ponte P.Bucci, Cubo 44C, 87036 Rende, Italy;2. Department of Physics, University of Calabria, Ponte P.Bucci, Cubo 31C, 87036 Rende, Italy;3. Institute of Catalysis and Inorganic Chemistry, ANAS, AZ1143 Baku, Azerbaijian;Institute of Physics, ANAS, AZ1143 Baku, Azerbaijian;Donostia International Physics Center (DIPC), Paseo de Manuel Lardizabal 4, 20018 San Sebastián/Donostia, Spain;4. Institute of Catalysis and Inorganic Chemistry, ANAS, AZ1143 Baku, Azerbaijian;5. Donostia International Physics Center (DIPC), Paseo de Manuel Lardizabal 4, 20018 San Sebastián/Donostia, Spain;Departamento de Fisica de Materiales, Universidad del Pais Vasco, Apartado 1072, 20080 San Sebastián/Donostia, Spain;Centro de Fisica de Materiales CFM-Materials Physics Center MPC, Centro Mixto CSIC-UPV/EHU, Paseo de Manuel Lardizabal 5, 20018 San Sebastián/Donostia, Spain;Saint Petersburg State University, 198504 Saint Petersburg, Russian Federation;Tomsk State University, 634050 Tomsk, Russian Federation
Abstract:Bismuth telluride (Bi2Te3) is one of the most important commercial thermoelectric materials. In recent years, the discovery of topologically protected surface states in Bi chalcogenides has paved the way for their application in nanoelectronics. Determination of the fracture toughness plays a crucial role for the potential application of topological insulators in flexible electronics and nanoelectromechanical devices. Using depth-sensing nanoindentation tests, we investigated for the first time the fracture toughness of bulk single crystals of Bi2Te3 topological insulators, grown using the Bridgman-Stockbarger method. Our results highlight one of the possible pitfalls of the technology based on topological insulators.
Keywords:topological insulators  bismuth telluride (Bi2Te3)  fracture toughness  nanoindentation
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