Magnetotransport Phenomena in Bi<sub>2</sub>Se<sub>3</sub> Thin Films and FIB-Patterned Single Crystals

POSTER

Abstract

Topological Insulators (TIs) have emerged as a novel class of quantum materials predicted to possess an insulating bulk and spin-momentum locked metallic states at the surface produced by a non-trivial topology of the band structure. Bi2Se3 is one of the most studied materials in the field, due to its relatively large band gap of 0.3 eV and its simple surface band structure consisting of a single and well-defined Dirac cone.
In the current work, we study the magnetotransport phenomena in Bi2Se3 devices patterned following two approaches, starting either from epitaxial thin films grown by pulsed laser deposition or from single crystals. For the fabrication of the devices, we use patterning techniques such as optical lithography and focused ion beam (FIB), including cryogenic milling, and the magnetotransport properties are investigated using fields up to 14 T and temperatures down to 2 K. The main findings to be reported in this contribution refer to a robust weak antilocalization effect in the thin films and to the minimization of ion-induced damage using cryogenic milling. Moreover, strategies to induce superconductivity in Bi2Se3 single crystals will also be discussed.

Presenters

  • Rubén Gracia-Abad

    • Instituto de Nanociencia y Materiales de Aragón, INMA, CSIC-University of Zaragoza, Spain

Authors

  • Rubén Gracia-Abad

    • Instituto de Nanociencia y Materiales de Aragón, INMA, CSIC-University of Zaragoza, Spain

  • Soraya Sangiao

    • Instituto de Nanociencia y Materiales de Aragón, INMA, CSIC-University of Zaragoza, Spain
    • Instituto de Nanociencia y Materiales de Aragón, INMA (CSIC-University of Zaragoza, Spain)

  • Chiara Bigi

    • TASC Laboratory in Area Science Park, 34139 Trieste, Italy, CNR-IOM

  • Sandeep Kumar Chaluvadi

    • TASC Laboratory in Area Science Park, 34139 Trieste, Italy, CNR-IOM

  • Pasquale Orgiani

    • TASC Laboratory in Area Science Park, 34139 Trieste, Italy, CNR-IOM

  • Geetha Balakrishnan

    • Physics, University of Warwick
    • Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
    • Department of Physics, The University of Warwick, Coventry, CV4 7AL, United Kingdom

  • JOSE MARIA DE TERESA NOGUERAS

    • Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-University of Zaragoza, Spain
    • Instituto de Nanociencia y Materiales de Aragón, INMA, CSIC-University of Zaragoza, Spain
    • Instituto de Nanociencia y Materiales de Aragón, INMA (CSIC-University of Zaragoza, Spain)