title: Phase Separation of Dirac Electrons in Topological Insulators at the Spatial Limit.
abstract: In this work we present unique signatures manifested by the local electronic properties of the topological surface state in Bi2Te3nanostructures as the spatial limit is approached. We concentrate on the pure nanoscale limit (nanoplatelets) with spatial electronic resolution down to 1 nm. The highlights include strong dependencies on nanoplatelet size: (1) observation of a phase separation of Dirac electrons whose length scale decreases as the spatial limit is approached, and (2) the evolution from heavily n-type to lightly n-type surface doping as nanoplatelet thickness increases. Our results show a new approach to tune the Dirac point together with reduction of electronic disorder in topological insulator (TI) nanostructured systems. We expect our work will provide a new route for application of these nanostructured Dirac systems in electronic devices.
authors.affiliation: Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María , Avenida España, 1680, Valparaíso, Chile.|Department of Physics, Stanford University , Stanford, California 94305, United States.|Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.
authors.forename: Carolina
authors.identifier: 0000-0003-3819-7614
authors.initials: C
authors.lastname: Parra
authors.affiliation: CTNanotubos, Universidade Federal de Minas Gerais , Rua Professor José Vieira de Mendonça 1.000, Engenho Nogueira, BH, Brazil.
authors.forename: Thiago Henrique
authors.initials: TH
authors.lastname: Rodrigues da Cunha
authors.affiliation: Department of Applied Physics, Stanford University , Stanford, California 94305, United States.
authors.forename: Alex W
authors.initials: AW
authors.lastname: Contryman
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.|Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.|National Laboratory of Solid State Microstructure, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
authors.forename: Desheng
authors.initials: D
authors.lastname: Kong
authors.affiliation: Laboratorio Nanobiomateriales, Departamento de Física, Universidad Técnica Federico Santa María , Avenida España, 1680, Valparaíso, Chile.
authors.forename: Francisco
authors.initials: F
authors.lastname: Montero-Silva
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais , CP 702 Belo Horizonte, MG CEP 30123-970, Brazil.
authors.forename: Pedro Henrique
authors.initials: PH
authors.lastname: Rezende Gonçalves
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais , CP 702 Belo Horizonte, MG CEP 30123-970, Brazil.
authors.forename: Diogo Duarte
authors.initials: DD
authors.lastname: Dos Reis
authors.affiliation: National High Magnetic Field Laboratory , Tallahassee, Florida 32310, United States.
authors.forename: Paula
authors.initials: P
authors.lastname: Giraldo-Gallo
authors.affiliation: Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso , Av. Gran Bretaña, 1111 Valparaíso, Chile.
authors.forename: Rodrigo
authors.identifier: 0000-0003-0928-0021
authors.initials: R
authors.lastname: Segura
authors.affiliation: Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso , Av. Gran Bretaña, 1111 Valparaíso, Chile.
authors.forename: Fernanda
authors.initials: F
authors.lastname: Olivares
authors.affiliation: Department of Physics, Stanford University , Stanford, California 94305, United States.|Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.
authors.forename: Francis
authors.initials: F
authors.lastname: Niestemski
authors.affiliation: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.|Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
authors.affiliation: Departamento de Física, Universidade Federal de Minas Gerais , CP 702 Belo Horizonte, MG CEP 30123-970, Brazil.
authors.forename: Rogerio
authors.initials: R
authors.lastname: Magalhaes-Paniago
authors.affiliation: Department of Physics, Stanford University , Stanford, California 94305, United States.|Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory , Menlo Park, California 94025, United States.
authors.forename: Hari C
authors.initials: HC
authors.lastname: Manoharan
keywords: Bi2Te3; Dirac electrons; Topological insulator nanostructures; doping; phase separation; scanning tunneling spectroscopy