Fabrication and characterization of quantum materials: graphene heterostructures and topological insulators

• Autores: Vito Clericò
• Directores de la Tesis: Enrique Díez Fernández (dir. tes.)
• Lectura: En la Universidad de Salamanca ( España ) en 2020
• Idioma: inglés
• Tribunal Calificador de la Tesis: Stephan Roche (presid.), Mario Amado Montero (secret.), Vittorio Bellani (voc.)
• Programa de doctorado: Programa de Doctorado en Física Aplicada y Tecnología por la Universidad de Salamanca
• Materias:
  • Física
    • Electrónica
      • Microscopia electrónica
    • Física del estado sólido
      • Propiedades de transporte de electrones
      • Semiconductores
      • Dispositivos de estado sólido
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• Resumen

  • Starting from a detailed description of the Clean Room facilities, installed during this thesis work, we report the fabrication processes based on graphene and other 2D materials in detail. In hBN-encapsulated graphene the Quantum Hall Effect (QHE) at room temperature and high magnetic field was observed. We found different features in the QHE respect a previous work on lower mobility graphene on silicon oxide (Novoselov et al. Science 315 1379 2007). A detalied study of transport properties in graphene nanoconstrictionsis also reported. In particular in encapsulated graphene we introduced a new cryo-etching method to obtain low roughness edges nanocostrictions, in which quantized conductance was observed. In the last part of the thesis we report transport measurements on InAs/GaSb double quantum wells with different bandgap configurations (inverted, normal or critical).